fun main(args: Array<String>) {
    val inputCount = readLine()!!.toInt()
    val noList = mutableSetOf<Int>()
    val yesList = mutableListOf<Int>()
    (1..inputCount).forEach {
        val inpt = readLine()!!.split(" ")
        val list = inpt.dropLast(1).map { it.toInt() }
        if(inpt.last().equals("NO")) {
            noList.addAll(list)
        } else {
            if(yesList.size == 0) {
                yesList.addAll(list)
            } else {
                val tmp = yesList.filter { list.contains(it) }
                yesList.clear()
                yesList.addAll(tmp)
            }
        }
    }
    val tmp = yesList.filter { !noList.contains(it) }
    yesList.clear()
    yesList.addAll(tmp)
    val target = (0..9).filter { !noList.contains(it) }
    if(target.size == 1) {
        println(target[0])
        return
    }
    println(yesList[0])
}