hour, time = input().split(":")

def solve(hour, time):
    hour = int(hour)
    time = int(time)
    shour = ""
    stime = ""
    time += 5
    if time > 59:
        time -= 60
        hour += 1
        if time < 10:
            stime = "0" + str(time)
        else:
            stime = str(time)
    else:
        if time < 10:
            stime = "0" + str(time)
        else:
            stime = str(time)
    if hour > 23:
        hour -= 24
        if hour < 10:
            shour = "0" + str(hour)
        else:
            shour = str(hour)
    else:
        if hour < 10:
            shour = "0" + str(hour)
        else:
            shour = str(hour)
    return shour + ":" + stime
solve

print(solve(hour, time))