#include <iostream>
#include <vector>
#include <string>
#include <cstring>
#include <math.h>
#include <cmath>
#include <limits.h>
#include <map>
#include <set>
#include <queue>
#include <algorithm>
#include <functional>
#include <stdio.h>
using namespace std;

long long MOD = 1000000007;

int main() {
    
    string ans = "NA";
    string S;
    cin >> S;
   
    int count = 1;
    for ( int i = 1; i < S.length(); i++ ) {
        if ( S[i] == S[i-1] ) { count++; }
        else { count = 1; }
        if ( count == 3 ) {
            ans = S[i] == 'O' ? "East" : "West";
            break;
        }
    }
    
    cout << ans << endl;
    
    return 0;
}