T = input()
i = T.index(":")
H = int(T[:i])
M = int(T[i + 1:])
M += 5
H += M // 60
M %= 60
H %= 24
if H < 10:
    print("0" + str(H) + ":", end = "")
else:
    print(str(H) + ":", end = "")
if M < 10:
    print("0" + str(M))
else:
    print(M)