#include <bits/stdc++.h>
#define rep(i, n) for (int i = 0; i < n; ++i)
using ll = long long;
using namespace std;
const int INF = 1e9;

int main() {
    string s;
    cin >> s;

    rep(i,s.size()){
        if(strncmp(&s[i],"OOO",3)==0){
            cout << "East" << endl;
            return 0;
        }
        if(strncmp(&s[i],"XXX",3)==0){
            cout << "West" << endl;
            return 0;
        }
    }

    cout << "NA" << endl;

    return 0;
}