#include <stdio.h>
#include <string.h>

void main(void){
	char game[1000] = "a";
	int eastWin = 0,westWin = 0;
	scanf("%s",game);
	int i = 0;
	while (game[i] != '\0'){
		if(game[i] == 'O'){
			westWin = 0;
			eastWin++;
		}else{
			eastWin = 0;
			westWin++;
		}
		if(eastWin == 3 || westWin == 3){
			break;
		}
		i++;
	}
	
	if((int)strlen(game) < 3 || eastWin != 3 && westWin != 3){
		printf("NA");
	}else if(eastWin == 3){
		printf("East");
	}else{
		printf("West");
	}

}