#include <iostream>
#include <vector>
using namespace std;
typedef long long ll;

int main() {
    string s;
    cin >> s;
    int cnt = 1;
    char prev = s[0];
    bool flag = false;
    for(int i = 1;i<s.size();i++) {
        if(s[i] == prev) {
            cnt++;
            if(cnt >= 3) {
                flag = true;
                break;
            }
        } else {
            cnt = 1;
            prev = s[i];
        }
    }
    if(flag) {
        if(prev == 'O')
            cout << "East" << endl;
        else
            cout << "West" << endl;
    } else
        cout << "NA" << endl;
}