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

int main(void)
{
	char s[101];
	int winner = 0;
	int i;

	scanf("%s", s);

	for (i = 0; i < strlen(s) - 2; i++) {
		if (s[i] == s[i + 1])
			if (s[i] == s[i + 2]) {
				if (s[i] == 'O') {
					winner = 1;
					break;
				} else {
					winner = -1;
					break;
				}
			}  

	}

	if (!winner)
		printf("NA\n");
	else if (winner == 1)
		printf("East\n");
	else
		printf("West\n");

	return 0;
}