#include<iostream>
#include<iomanip>
#include<cmath>
#include<string>
#include<algorithm>
#include<vector>
#include<math.h>
#include<stack>
using namespace std;
int main(void){
    string S; cin >> S;
    int cnt = 0;
    while(true){
        if(S.size() < 3){
            cout << "NA" << endl;
            break;
        }else{
    for(int i = 1; i < S.size() - 1; i++){
        if(S[i] == S[i-1] && S[i] == S[i+1] && S[i] == 'O'){
            cnt++;
            cout << "East" << endl;
            break;
        }
        if(S[i] == S[i-1] && S[i] == S[i+1] && S[i] == 'X'){
            cout << "West" << endl;
            cnt++;
            break;
        }
    }
            
        }
        if(cnt == 0){
            cout << "NA" << endl;
            break;
        }
        break;
    }
    return 0;
}