#include <bits/stdc++.h>

using namespace std;

int main(int argc, char **argv) {
	char S[101];
	scanf("%s", S);

	char cur = '\0';
	int cnt = 0;
	for (int i = 0; i < strlen(S); i++) {
		if (S[i] != cur) {
			cnt = 1;
			cur = S[i];
		} else if (S[i] == cur) {
			cnt++;
		}
		if (cnt >= 3) {
			if (cur == 'O') {
				printf("East\n");
			} else {
				printf("West\n");
			}
			return 0;
		}
	}
	printf("NA\n");
	return 0;
}