#include<bits/stdc++.h>
using namespace std;
int main(){
    string s,ans;
    cin>>s;
    auto east=s.find("OOO"),west=s.find("XXX");
    if(east==string::npos&&west==string::npos)ans="NA";
    else if(east<west)ans="East";
    else ans="West";
    cout<<ans<<endl;
}