#include<iostream>
#include<vector>
#include<algorithm>

using namespace std;
using ll = long long;

int main(){
    cin.tie(nullptr);
    ios::sync_with_stdio(false);

    string s;
    cin>>s;
    int n = s.size();
    for(int i = 1;i+1<n;i++){
        if(s[i]==s[i-1]&&s[i]==s[i+1]){
            if(s[i]=='O'){
                cout<<"East\n";
                return 0;
            }else{
                cout<<"West\n";
                return 0;
            }
        }
    }
    cout<<"NA\n";
}