#include <bits/stdc++.h>
using namespace std;
int main(){
    string s; cin >> s;
    int higasi=0, nisi=0,counter=0,flag=0;
    for(int i=0; i < s.size(); i++){
        if(s[i] == 'O'){
            higasi++;
            counter++;
        }
        else {
            counter = 0;
            nisi++;
        }
        if(counter == 3) flag = 1;
    }
    if(s.size() < 3){
        higasi = 0;
        nisi = 0;
    }
    if(higasi > nisi || flag){
        cout << "East" << endl;
    }
    else if(higasi < nisi){
        cout << "West" << endl;
    }
    else{
        cout << "NA" << endl;
    }
}