wake = input()
min = int(wake[0])*600 + int(wake[1])*60 + int(wake[-2])*10 + int(wake[-1]) #分に直す
wakeAgain = min + 5
if 24*60 <= wakeAgain:
	wakeAgain -= 24*60
	print(str(wakeAgain//60//10) + str(wakeAgain//60%10) + ":" + str(wakeAgain%60//10) + str(wakeAgain%60%10))
else:
	print(str(wakeAgain//60//10) + str(wakeAgain//60%10) + ":" + str(wakeAgain%60//10) + str(wakeAgain%60%10))