#include <algorithm>
#include <cstdio>
#include <iostream>
#include <map>
#include <cmath>
#include <queue>
#include <set>
#include <sstream>
#include <stack>
#include <string>
#include <vector>
#include <stdlib.h>
#include <stdio.h>
#include <bitset>
using namespace std;
#define FOR(I,A,B) for(int I = (A); I < (B); ++I)
typedef long long ll;

int main(){
  string s;
  cin >> s;
  int East = 0, West = 0;
  FOR(i,0,s.length()){
    if(s[i] == 'O') {
      East++;
      West = 0;
      if(East == 3) {
        cout << "East" << endl;
        return 0;
      }
    } else {
      East = 0;
      West++;
      if(West == 3) {
        cout << "West" << endl;
        return 0;
      }
    }
  }
  cout << "NA" << endl;
  return 0;
}