#include<bits/stdc++.h>
using namespace std;
using ll =long long;
using vll =vector<ll>;
#define all(A) A.begin(),A.end()
#define rep(i, n) for (long long i = 0; i < (long long)(n); i++)



int main(){
    string S;
    cin>>S;
    rep(i,S.size()-2){
        if(S[i]=='O'&&S[i+1]=='O'&&S[i+2]=='O'){
            cout<<"East"<<endl;return 0;
        }
        if(S[i]=='X'&&S[i+1]=='X'&&S[i+2]=='X'){
            cout<<"West"<<endl;return 0;
        }
    }
    cout<<"NA"<<endl;

}