#include<bits/stdc++.h>
#define range(i,a,b) for(int i = (a); i < (b); i++)
#define rep(i,b) for(int i = 0; i < (b); i++)
#define all(a) (a).begin(), (a).end()
#define show(x)  cerr << #x << " = " << (x) << endl;
#define debug(x) cerr << #x << " = " << (x) << " (L" << __LINE__ << ")" << " " << __FILE__ << endl;
const int INF = 2000000000;
using namespace std;

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

    if(s.size() <= 2){
        cout << "NA" << endl;
        return 0;
    }
    rep(i,s.size() - 2){
        if(s.substr(i,3) == "OOO"){
            cout << "East" << endl;
            return 0;
        }else if(s.substr(i,3) == "XXX"){
            cout << "West" << endl;
            return 0;
        }
    }
    cout << "NA" << endl;
    return 0;
}