#include <bits/stdc++.h>  
 
using namespace std;
 
#define FOR(i, j, k) for(int i = j; i < k; ++i)
#define rep(i, j) FOR(i, 0, j)
#define repr(i, j) for(int i = j; i >= 0; --i)
#define INF (1 << 30)
#define MOD 1e9 + 7
 
typedef long long ll;
typedef unsigned long long ull;
typedef pair<int, int> P;

int main() {
	string s;
	cin >> s;
	int west = 0, east = 0;
	rep(i, s.size()) {
		if(s[i] == 'O') {
			++east;
			west = 0;
			if(east == 3) {
				printf("East\n");
				return 0;
			}
		}
		else {
			++west;
			east = 0;
			if(west == 3) {
				printf("West\n");
				return 0;
			}
		}
	}
	printf("NA\n");
	return 0;
}