a,b,s = input().split()
a = int(a)
b = int(b)
pm = s[3]
s = s.replace("UTC","")
if "." in s:
    c,d = map(int,s.split("."))
else:
    c = int(s)
    d = 0

if pm == "-":
    b -= 6 * d
    if b < 0:
        b += 60
        a -= 1
else:
    b += 6 * d
    if b >= 60:
        b -= 60
        a += 1

a -= 9 - c
a %= 24
a = ("0" + str(a))[-2:]
b = ("0" + str(b))[-2:]

print(a + ":" +b)