#include <iostream>
using namespace std;
int main(){
    string str,ans="NA";
    cin >> str;
    for(int i=0;i+2<str.size();i++){
        if(str[i]==str[i+1] && str[i]==str[i+2]){
            if(str[i]=='O')ans="East";
            else ans="West";
            break;
        }
    }
    cout << ans << endl;
    return 0;
}