#include<iostream>
#include<vector>
#include<string>
#include<cstdio>
using namespace std;
int main(){
    string s;
    int count=1,flag=0,i;
    cin >> s;
    for(i=1;s[i]!='\0';i++){
        if(s[i]==s[i-1]){
            count++;
            if(count==3){
                if(s[i]=='O'){
                    cout << "East";
                    return 0;
                }
                else{
                    cout << "West";
                    return 0;
                }
            }
        }
        else{
            count=0;
        }
    }
    count++;
    if(count==3&&i>3){
           if(s[i]=='O'){
               cout << "East";
               return 0;
           }
           else{
               cout << "West";
               return 0;
           }
    }
    cout << "NA\n";
    return 0;
}