650 B | 650 chars
import sys
from math import sqrt, pi, sin, factorial
inp = lambda : sys.stdin.readline()[:-1].strip()
mii = lambda x = " " : [*map(int,inp().split(x))]
mfi = lambda x = " " : [*map(float,inp().split(x))]
ii = lambda : int(inp())
fi = lambda : float(inp())
p = print
def solve():
mx = 0
mn = 1111111111111111
for i in range(3):
a, b, c, d = mii()
x = a * 60 + b
y = c * 60 + d
if x < y:
d = y - x
else:
d = 1440 - x + y
mx = max(mx, d)
mn = min(mn, d)
print(f"{mn//60}:{mn%60:02d}")
print(f"{mx//60}:{mx%60:02d}")
if __name__ == "__main__":
tc = 1
for t in range(1, tc+1):
ret = solve()