#include "bits/stdc++.h"
using namespace std;

int main(){
string s;
cin >>s;
for(int i=2;i<s.size();i++){
    if(s.at(i-2)=='O'&&s.at(i-1)=='O'&&s.at(i)=='O'){
        cout<<"East"<<endl;
        break;
    }
    if(s.at(i-2)=='X'&&s.at(i-1)=='X'&&s.at(i)=='X'){
        cout<<"West"<<endl;
        break;
    }
    if(i==s.size()-1){
        cout<<"NA"<<endl;
    }
}
}