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

int main(){
    string s;
    cin >> s;
    int l=s.size();
    
    int east=0,west=0;
    for(int i=0; i<l; i++){
        if(s[i]=='O'){
            east++;
            west=0;
        }else{
            west++;
            east=0;
        }
        if(east==3){
            cout << "EAST" << endl;
            return 0;
        }
        else if(west==3){
            cout << "WEST" << endl;
            return 0;
        } 
    }
    cout << "NA" << endl;
}