#include<bits/stdc++.h>
using namespace std;

int main(){
    string S;
    cin >> S;
    int e,w;

    e=(S.find("OOO")!=string::npos)?S.find("OOO"):101;
    w=(S.find("XXX")!=string::npos)?S.find("XXX"):101;
    if(e<w) cout << "East" << endl;
    else if(w<e) cout << "West" << endl;
    else cout << "NA" << endl;

    return 0;
}