current_time = list(map(int, input().split(":")))
start_time = list(map(int, input().split(":")))
current_sec = current_time[0]*3600 + current_time[1]*60 +current_time[2]
start_sec = start_time[0]*3600 + start_time[1] * 60 + start_time[2]
sub_time = start_sec -current_sec
if sub_time < 0:
sub_time += 24*3600
print(f"{sub_time//3600:02d}:{(sub_time%3600)//60:02d}:{sub_time%60:02d}")
Python
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