#include <bits/stdc++.h>
using namespace std;
int main()
{
    string s;
    cin>>s;
    if(s.length()>3){
        for(int i=0;i<s.length()-2;i++){
            if(s[i]=='O'&&s[i+1]=='O'&&s[i+2]=='O'){
                cout<<"East"<<endl;
                return 0;
            }
            else if(s[i]=='X'&&s[i+1]=='X'&&s[i+2]=='X'){
                cout<<"West"<<endl;
                return 0;
            }
        }
    }
    cout<<"NA"<<endl;
    return 0;
}