#include<iostream>
#include<algorithm>
#include<cstdio>
#include<cstdlib>
#include<vector>
#include<map>
#include<queue>
#include<string>
#include<sstream>
#include<cmath>
#include<numeric>
using namespace std;

int main(){

  string s;
  cin >> s;

  int o = 0;
  int x = 0;
  for(int i=0; i<s.size(); i++){
    if( s[i] == 'O' ){
      o++;
      x = 0;
    }
    if( s[i] == 'X' ){
      x++;
      o = 0;
    }
    if( o == 3 ){
      cout << "East" << endl;
      return 0;
    }
    if( x == 3 ){
      cout << "West" << endl;
      return 0;
    }
  }
  cout << "NA" << endl;

  return 0;
}