#include <bits/stdc++.h>
using namespace std;
int main(){
    string s; cin >> s;
    int win=0,lose=0;
    for(int i=0; i < s.size(); i++){
        if(s[i] == 'O') {win++; lose=0;}
        else {lose++; win=0;}
        if(win == 3 || lose == 3){
            cout << (win == 3 ? "East" : "West") << endl;
            return 0;
        }
    }
    cout << "NA" << endl;
}