#include <bits/stdc++.h>
#define rep(i, a, n) for(int i = a; i < n; i++)
#define repb(i, a, b) for(int i = a; i >= b; i--)
#define all(a) a.begin(), a.end()
#define o(a) cout << a << endl
#define int long long
#define first fi
#define second se
using namespace std;
typedef pair<int, int> P;

signed main(){
    string s;
    cin >> s;
    char now = s[0], ans = '?';
    int cnt = 1;
    rep(i, 1, s.size()){
        if(s[i] == now){
            cnt++;
            if(cnt == 3){
                ans = now;
                break;
            }
        }else{
            now = s[i];
            cnt = 1;
        }
    }
    if(ans == '?') cout << "NA" << endl;
    else if(ans == 'O') cout << "East" << endl;
    else cout << "West" << endl;
}