01. Sum Seconds

first_time = int(input())
second_time = int(input())
third_time = int(input())
seconds = first_time + second_time + third_time

print(f'{seconds // 60}:{seconds % 60:02}')

Тарикатско решение:)

seconds = int(input()) + int(input()) + int(input())

print(f'{seconds // 60}:{seconds % 60:02}')