#include <iostream>
#include <list>
#include <vector>
#include <string>
#include <stdio.h>
#include <stdint.h>
#include <iomanip>
using namespace std;

using uint = unsigned int;
using ll = long long;

#define CIN( LL , A ) LL A; cin >> A 
#define GETLINE( A ) string A; getline( cin , A ) 
#define FOR_ITR( ARRAY , ITR , END ) for( auto ITR = ARRAY .begin() , END = ARRAY .end() ; ITR != END ; ITR ++ ) 

int main()
{

  CIN( string , S );
  const string O = "O";
  string which = "";
  uint num = 0;
  string answer = "NA";
  const uint& size = S.size();

  for( uint i = 0 ; i < size ; i++  ){

    const string c = S.substr( i , 1 );

    if( which == c ){

      num++;

      if( num == 3 ){

	answer = c == O ? "East" : "West";
	i = size;

      }

    } else {

      which = c;
      num = 1;

    }

  }
  
  cout << answer << endl;
  return 0;

}