import java.util.Scanner

data class Count(var eastCount: Int, var westCount: Int)

class No486() {
	val input = Scanner(System. `in`).next()
	val count = Count(0, 0)

	fun victoryOrDefeat(): Count {
		run breaker@ {
			input.forEach {
				if (it == 'O') {
					count.eastCount++
					count.westCount = 0
				} else {
					count.westCount++
					count.eastCount = 0
				}
				if(count.eastCount == 3 || count.westCount == 3) return@breaker
			}
		}
		return count
	}

}

fun main(args: Array<String>) {
	val no486 = No486().victoryOrDefeat()
	var winner = if (no486.eastCount > no486.westCount) "East" else "West"
	if (no486.eastCount < 3 && no486.westCount < 3) winner = "NA"
	println(winner)
}