#include <iostream>
#include <string>
using namespace std;

int main()
{
    string s;
    cin >> s;

    int east = 0,west = 0;
    for(int i = 0; i < s.length(); i++){
        if(s[i]=='O'){
            east++;
            west = 0;
            if(east == 3){
                cout << "East\n" << endl;
                return 0; 
            }
        }else{
            west++;
            east = 0;
            if(west == 3){
                cout << "West\n" << endl;
                return 0;
            }
        }
    }
    cout << "NA\n";

    return 0;
}