fun main(args: Array<String>) {
	val n = readLine()!!.toInt()
	val dic = MutableList(10) { 1 }

	for (i in 0 until n) {
		val input = readLine()!!.split(" ")
		for (j in 0 until 4) {
			dic[input[j].toInt()] *= listOf(0, 2)[if (input.last() == "NO") 0 else 1]
		}
	}
	println(dic.indexOf(dic.max()))
}