#include <iostream>
#include <algorithm>
using namespace std;

int main(){
    string s;
    cin >> s;
    int l = s.size();
    string ans = "NA";
    if ( l >= 3 ) {
        for ( int i = 0; i < l-2; i++ ){
            if ( s[i] == 'o' && s[i+1] == 'o' && s[i+2] == 'o' && ans == "NA" ) ans = "East";
            else if ( s[i] == 'x' && s[i+1] == 'x' && s[i+2] == 'x' && ans == "NA" ) ans = "West";
        }
    }
    cout << ans << endl;
    return 0;
}