def main():
    a, b, S = input().split()
    a = int(a)
    b = int(b)
    c = float(S.replace('UTC', '')) - 9
    t = a * 60 + b + c * 60
    
    h = int(t // 60 % 24)
    m = int(t % 60 + 0.1)
    print('{0:02}:{1:02}'.format(h, m))
        

if __name__ == "__main__":
    main()