#!/usr/bin/env python3

import datetime


def solve(h, m, offset):
    t0 = datetime.datetime(year=2018, month=3, day=3,
                           hour=h, minute=m)
    dm0 = (offset - 9.0) * 60
    dh, dm = divmod(dm0, 60)
    dt = datetime.timedelta(hours=dh, minutes=dm)
    t1 = t0 + dt
    return t1.hour, t1.minute


def main():
    a0, b0, s0 = input().split()
    h, m = int(a0), int(b0)
    offset = float(s0[3:])
    h1, m1 = solve(h, m, offset)
    print("{:02d}:{:02d}".format(h1, m1))


if __name__ == '__main__':
    main()