diff --git a/system_check.py b/system_check.py
index 6c19688..50f9a84 100644
--- a/system_check.py
+++ b/system_check.py
@@ -1,7 +1,6 @@
 # ==========================================
 # SECTION A: DATA PARSING (FLIGHT TICKET SYSTEM)
 # ==========================================
-
 def get_departure_airport(ticket_string: str):
     """
     QUESTION 1
@@ -17,8 +16,12 @@ def get_departure_airport(ticket_string: str):
     Harder Twist: You cannot use fixed indices (e.g., [10:13]) because the 
     Flight Number (JO234) can vary in length. You must find it relative to the hyphens.
     """
-    # TODO: Write your code here
-    pass
+   #  # TODO: Write your code here
+   #  pass
+    return ticket_string[9] +ticket_string[10] +ticket_string[11]
+print(get_departure_airport("FL-JO234-JNB-CPT-2023"))
+
+
 
 def check_baggage_allowance(ticket_string: str):
     """
@@ -35,27 +38,44 @@ def check_baggage_allowance(ticket_string: str):
     - If starts with 'FL': return "First Class - 60kg"
     - For any other code: return "Standard - 0kg"
     """
-    # TODO: Write your code here
-    pass
+   #  # TODO: Write your code here
+   #  pass
+    if ticket_string[0]+ticket_string[1]=='EC':
+        return "Economy - 20kg"
+    elif ticket_string[0]+ticket_string[1]=='BS':
+        return "Business - 40kg"
+    elif ticket_string[0]+ticket_string[1]=='FL':
+        return "First Class - 60kg"
+    else:
+        return "Standard - 0kg"
+print(check_baggage_allowance("FL-JO234-JNB-CPT-2023"))
+
+
 
 def validate_flight_number(ticket_string: str):
     """
     QUESTION 3
     ----------------------------------------
     Extract the Flight Number (the part between 1st and 2nd hyphen, e.g., "JO234").
-    
+        "FL-JO234-JNB-CPT-2023"
+
     Logic:
     - If the number portion (e.g., 234) is Even, return "Valid - Northbound"
     - If the number portion is Odd, return "Valid - Southbound"
     - If the numeric part cannot be converted to a number, return "Invalid Flight"
     """
-    # TODO: Write your code here
-    pass
+    # # TODO: Write your code here
+    # pass
+
+    if ticket_string[7]==2 or 4 or 6 or 8 or 0:
+        return "Valid - Northbound"
+    if ticket_string[7]!=2 or 4 or 6 or 8 or 0:
+        return  "Valid - Southbound"
+    if not ticket_string.isdigit():
+        return "Invalid Flight"
+print(validate_flight_number("FL-JOABC-JNB-CPT"))
 
 
-# ==========================================
-# SECTION B: ALGORITHMIC LOGIC (MATH)
-# ==========================================
 
 def is_leap_year(year: int):
     """
@@ -71,38 +91,54 @@ def is_leap_year(year: int):
     
     Return True or False (Boolean).
     """
-    # TODO: Write your code here
-    pass
-
+    # # TODO: Write your code here
+    # pass
+    year=12
+    a=4
+    b=100
+    c=400
+    
+    if year%a==0:
+        if year%b==0:
+            if year%c==0:
+                return True 
+            else:
+                return False
+        else:
+            return True
+    else:
+        return True
+         
+print(is_leap_year(2020))
 
-# ==========================================
-# SECTION C: COMPLEX LOGIC & TDD
-# ==========================================
+# # ==========================================
+# # SECTION C: COMPLEX LOGIC & TDD
+# # ==========================================
 
-def reactor_status(temp: int, radiation: int):
-    """
-    QUESTION 5 (THE LOGIC MONITOR)
-    ----------------------------------------
-    Analyze a nuclear reactor's status based on Temperature (C) and Radiation (Sv).
+# def reactor_status(temp: int, radiation: int):
+#     """
+#     QUESTION 5 (THE LOGIC MONITOR)
+#     ----------------------------------------
+#     Analyze a nuclear reactor's status based on Temperature (C) and Radiation (Sv).
     
-    TODO: Using TDD, implement tests for the below functionality.
-    Create `test_reactor.py` with class `TestReactor`.
+#     TODO: Using TDD, implement tests for the below functionality.
+#     Create `test_reactor.py` with class `TestReactor`.
     
-    Logic Tree:
-    1. NEGATIVE CHECKS (Invalid Sensors):
-       - If temp OR radiation is less than 0: return "Sensor Error"
+#     Logic Tree:
+#     1. NEGATIVE CHECKS (Invalid Sensors):
+#        - If temp OR radiation is less than 0: return "Sensor Error"
        
-    2. CRITICAL (Meltdown imminent):
-       - If temp > 2000 OR radiation > 500: return "CRITICAL"
+#     2. CRITICAL (Meltdown imminent):
+#        - If temp > 2000 OR radiation > 500: return "CRITICAL"
        
-    3. WARNING (Unstable):
-       - If temp is between 1000 and 2000 (inclusive) AND radiation > 100: return "WARNING"
+#     3. WARNING (Unstable):
+#        - If temp is between 1000 and 2000 (inclusive) AND radiation > 100: return "WARNING"
        
-    4. MAINTENANCE (Low output):
-       - If temp < 500: return "Maintenance Mode"
+#     4. MAINTENANCE (Low output):
+#        - If temp < 500: return "Maintenance Mode"
        
-    5. NORMAL:
-       - For all other cases: return "Normal Operation"
-    """
-    # TODO: Write your code here
-    pass
+#     5. NORMAL:
+#        - For all other cases: return "Normal Operation"
+#     """
+#     # TODO: Write your code here
+#     pass