## https://yukicoder.me/problems/no/525


def main():
    T = input()

    h, m = map(int, T.split(':'))
    total_minute = h * 60 + m

    total_minute += 5

    total_minute %= 24 * 60

    h = total_minute // 60
    m = total_minute % 60
    vv = 10000 + h * 100 + m
    vv = str(vv)
    answer = vv[1:3] + ":" + vv[3:5]
    print(answer)


if __name__ == '__main__':
    main()