#include <iostream>
#include <fstream>
#include <vector>
#include <string>
#include <algorithm>
//---------------------------
using namespace std;
//---------------------------
#define REP(i,n) for(int i = 0; i < (n); i++)
#define P(x) cout << (x) << "\n"
//---------------------------


int main(){
  std::ios::sync_with_stdio(false);
  std::cin.tie(0);



  string s;cin >> s;
  int a = s.size();
  if (a < 3) {
    P("NA");
  }
  REP(i,a - 2){
    if ((s[i] == 'O' && s[i+1] == 'O' )&& s[i+2] == 'O') {
      P("East");
      break;
    }else if (s[i] == 'X' && s[i+1] == 'X' && s[i+2] == 'X') {
      P("West");
      break;
    }else if (i == a - 3) {
      P("NA");
      break;
    }
  }
  return 0;
}