#include <iostream>
#include <string>
#include <vector>
#include <algorithm>
#include <queue>
#include <cmath>
#include <climits>
#include <iomanip>
#include <set>
#include <map>
using namespace std;
typedef long long ll;
int main(){
    string s;
    cin >> s;
    ll e = 0;
    ll w = 0;
    for(int i = 0;i < (int)s.size();i++){
        if(s[i] == 'O')e++,w = 0;
        else w++,e = 0;
        if(e >= 3){
            cout << "East" << endl;
            return 0;
        }
        if(w >= 3){
            cout << "West" << endl;
            return 0;
        }
    }
    cout << "NA" << endl;
}