#include <stdio.h>
#include <algorithm>
using namespace std;
using ll = long long;

int main() {
	char s[101];
	scanf("%s", s);
	int carry = 1, res = 0;
	for (int i = 1; s[i] != 0; i++) {
		if (s[i] != s[i - 1]) {
			carry = 1;
		} else {
			carry++;
			if (3 <= carry) {
				res = s[i] == 'O' ? 1 : 2;
				break;
			}
		}
	}
	char *ss[] = { "NA", "East", "West" };
	printf("%s\n", ss[res]);
}