#include<cstdio>
#include<cstdlib>
#include<cstring>
#include<cmath>
#include<ctime>
#include<cctype>
#include<climits>
#include<iostream>
#include<string>
#include<vector>
#include<map>
#include<list>
#include<queue>
#include<deque>
#include<algorithm>
#include<numeric>
#include<utility>
#include<complex>
#include<memory>
#include<functional>

using namespace std;

int main() {
    cin.tie(0);
    ios::sync_with_stdio(false);

    
    string s;
    cin >> s;
    int west = 0;
    int east = 0;
    for (int i = 0; i < s.size(); i++) {
        if (s[i] == 'O') {
            east++;
            west = 0;
        } else {
            east = 0;
            west++;
        }
        if (west == 3) {
            cout << "West" << endl;
            return 0;
        }
        if (east == 3) {
            cout << "East" << endl;
            return 0;
        }
    }
    cout << "NA" << endl;
    return 0;
}