from math import isclose

def main():
    a, b, c = input().split()
    h = int(a)
    m = int(b)
    delta = float(c.replace("UTC", "")) - 9
    h += int(delta)
    h = h % 24
    m += round((delta - int(delta)) * 60)
    if not isclose(m, 0):
        m += 60
        h -= 1
    if not isclose(h, 0):
        h += 24
    h += m // 60
    m = m % 60
    h = h % 24
    print(f"{h:02d}:{m:02d}")

if __name__ == "__main__":
    main()