#include <iostream>
#include <cstdio>
#include <cstdlib>
#include <cstring>
#include <string>
#include <sstream>
#include <complex>
#include <algorithm>
#include <functional>
#include <vector>
#include <stack>
#include <queue>
#include <set>
#include <map>
#include <cmath>
#include <typeinfo>
#include <cassert>
#include <fstream>
#define REP(i,n) for(int i=0;i<n;i++)
#define FOR(i,a,b) for(int i = a;i<b;i++)
#define SSTR( x ) static_cast< std::ostringstream & >( \
        ( std::ostringstream() << std::dec << x ) ).str()
#define ALL(s) (s).begin(), (s).end()
using namespace std;
typedef long long unsigned int llu;
typedef long long ll;

int main (){
  string s;
  while (cin >> s){
    char now = s[0];
    int win = 1;
    bool isEnd = false;
    FOR(i,1,s.size()){
      if(s[i] == now){
	win++;
	if(win == 3){
	  if(now == 'O')cout << "East"<<endl;
	  else cout << "West" << endl;
	  isEnd = true;
	  break;
        }
      }else{
	now = s[i];
	win = 1;
      }
    }
    if(!isEnd)cout << "NA" << endl;
  }
  return 0;
}