func main()
	var ss: [][]char :: cui@input().split("/")
	var y: int :: ss[0].toInt(&)
	var m: int :: ss[1].toInt(&)
	var d: int :: ss[2].toInt(&)
	var time: int :: lib@dateToInt(y, m, d, 0, 0, 0) + 86400 * 2
	do lib@intToDate(time, &y, &m, &d, &, &, &)
	do cui@print("\{y.toStrFmt("04d")}/\{m.toStrFmt("02d")}/\{d.toStrFmt("02d")}\n")
end func