#include <iostream>
#include <string>
#include <vector>
#include <algorithm>
using namespace std;

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