import math
lis = list(map(str,input().split()))
a = int(lis[0])
b = int(lis[1])
c = float(lis[2][4:])
if lis[2][3] == "-":c *= -1
c -= 9
d = (c % 1) * 60
c = math.floor(c)
ans = [a+c,":",int(b+d)]
for i in range(3):print(ans[i],end="")