#include<bits/stdc++.h>
#define rep(i,n)for(int i=0;i<n;i++)
using namespace std;

int main() {
	int a = 0, b = 0; string s; cin >> s;
	for (char c : s) {
		if (c == 'O')a++, b = 0;
		else b++, a = 0;
		if (a >= 3) {
			puts("East"); return 0;
		}
		if (b >= 3) {
			puts("West"); return 0;
		}
	}
	puts("NA");
}