from datetime import timedelta

def main():
    T = input()

    hh, mm = map(int, T.split(':'))
    t1 = timedelta(hours=hh, minutes=mm + 5)
    t2 = timedelta(days=1)

    ans = str(t1 % t2)
    if len(ans) == 8:
        print(ans[:-3])
    else:
        print('0' + ans[:-3])

main()