#include <iostream>
#include <math.h>
#include <algorithm>
#include <functional>
#include <vector>
#include <typeinfo>
#include <climits>
#include <ctype.h>
#include <string>
using namespace std;
#define INIT cin.tie(0); ios::sync_with_stdio(false);
#define FOR(i, a, n) for (int i = a; i < n; i++)
#define REP(i, n) for(int i = 0; i < n; i++)

int main()
{
    INIT;

    string s;
    cin >> s;

    int f = 2;
    if(s.size() >= 3){
        REP(i, s.size() - 2){
            if(s[i] == 'O' and s[i + 1] == 'O' and s[i + 2] == 'O'){
                f = 0;
                break;
            }else if(s[i] == 'X' and s[i + 1] == 'X' and s[i + 2] == 'X'){
                f = 1;
                break;
            }
        }
    }
    if(f == 0) cout << "East" << endl;
    else if(f == 1) cout << "West" << endl;
    else cout << "NA" << endl;

    return 0;
}