#include <bits/stdc++.h>
#define rep(i,n) for (int i=0; i<(n); ++i)
using namespace std;
using ll=long long;
int main(){
    string s;
    cin>>s;
    int n=s.length();
    rep(i,n-2){
        if(s[i]==s[i+1]&&s[i+1]==s[i+2]){
            if(s[i]=='O'){
                cout<<"East"<<endl;
                return 0;
            }
            else{
                cout<<"West"<<endl;
                return 0;
            }
        }
    }
    cout<<"NA"<<endl;
}