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