func main()
	var s: [][]char :: cui@input().split(":")
	var h: int :: s[0].toInt(&)
	var m: int :: s[1].toInt(&)
	do m :+ 5
	if(m >= 60)
		do m :- 60
		do h :+ 1
	end if
	if(h = 24)
		do h :: 0
	end if
	do cui@print("\{h.toStrFmt("02d")}:\{m.toStrFmt("02d")}\n")
end func