package net.ipipip0129.kotlin.yukicoder

fun main(args: Array<String>) {
    val line = readLine()!!
    val kusaList = getKusaList(line)
    if(kusaList.size != 0) {
        val maxCount = kusaList.maxBy { it.count }!!.count

        kusaList.forEach {
            if (it.count == maxCount) {
                println(it.str)
            }
        }
    }
}

private fun getKusaList(str: String): ArrayList<Kusa> {
    var left = 0
    var right = 0
    var count = 0

    val kusaString = str + "終"

    val kusaList = ArrayList<Kusa>()

    kusaString.forEachIndexed { index, c ->
        run {
            when (c) {
                'ｗ' -> {
                    if (right != 0) {
                        count += 1
                    }
                }
                else -> {
                    if (count != 0) {
                        kusaList.add(Kusa(count, str.substring(left, right).replace("ｗ", "")))
                        left = index
                        count = 0
                    }
                    right = index + 1
                }
            }
        }
    }

    return kusaList
}

private class Kusa(val count: Int, val str: String)