# coding: utf-8
def get_ln_inputs():
    return input().split()


def get_ln_int_inputs():
    return list(map(int, get_ln_inputs()))


def get_hour_and_min(input):
    return int(input[:2]), int(input[3:])


def main():
    h, m = get_hour_and_min(get_ln_inputs()[0])
    m += 5
    if m >= 60:
        m -= 60
        h += 1
    if h >= 24:
        h -= 24
    print(('%02d' % h) + ":" + ('%02d' % m))


main()