#include <bits/stdc++.h>
using namespace std;
using ll = long long;
#define fi first
#define se second
int main(){
    string s;
    cin >> s;
    int n = s.size();
    for(int i = 0; i < n - 2; i++){
        if(s.substr(i, 3) == "OOO"){
            cout << "East\n";
            return 0;
        }
        else if(s.substr(i, 3) == "XXX"){
            cout << "West\n";
            return 0;
        }
    }
    cout << "NA\n";
    return 0;
}