diff --git a/lab0/lab.py b/lab0/lab.py
index ca8710f..96c522d 100644
--- a/lab0/lab.py
+++ b/lab0/lab.py
@@ -2,18 +2,34 @@ def middle(a, b, c):
     """Return the number among a, b, and c that is not the smallest or largest.
     Assume a, b, and c are all different numbers.
     """
-    return ____
+    return sorted([a, b, c])[1]
 
 
 def sum_digits(y: int) -> int:
     """
     Sum all the digits of y.
     """
-    pass
+    sum = 0
+    while y > 0:
+        digit = y % 10
+        y //= 10
+        sum += digit
+    return sum
 
 
 def double_eights(n: int) -> bool:
     """
     Return True if n has two eights in a row.
     """
-    pass
\ No newline at end of file
+    prev_eight = False
+    while n > 0:
+        digit = n % 10
+        if digit == 8:
+            if prev_eight:
+                return True
+            else:
+                prev_eight = True
+        else:
+            prev_eight = False
+        n //= 10
+    return False
\ No newline at end of file