a, b, S = input().split()
a = int(a) - 9
b = int(b)
if "+" in S:
    x = S[4:]
    if "." in x:
        x, y = x.split(".")
        a += int(x)
        b += 6 * int(y)
    else:
        a += int(x)
else:
    x = S[4:]
    if "." in x:
        x, y = x.split(".")
        a -= int(x)
        b -= 6 * int(y)
    else:
        a -= int(x)
if b < 0:
    b += 60
    a -= 1
elif b >= 60:
    b -= 60
    a += 1
a %= 24

print("{:0=2}:{:0=2}".format(a, b))