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

int main(void){
    char S[101];
	int W=0,E=0,i;
	scanf("%s", S);
	for (i = 0; S[i] != 0; i++) {
		if (S[i] == 'O' && S[i+1] == 'O' && S[i+2] == 'O') {
			E += 1;
			printf("East");
			break;
		}
		if (S[i] == 'X' && S[i + 1] == 'X' && S[i + 2] == 'X') {
			W += 1;
			printf("West");
			break;
		}
		
	}
	if (W == 0 && E == 0) {
		printf("NA");
	}
}