#include <bits/stdc++.h>

using namespace std;
typedef long long ll;
typedef vector<int> VI;
typedef vector<VI> VVI;
typedef vector<ll> VL;
typedef vector<VL> VVL;
typedef pair<int, int> PII;

#define FOR(i, a, n) for (ll i = (ll)a; i < (ll)n; ++i)
#define REP(i, n) FOR(i, 0, n)
#define ALL(x) x.begin(), x.end()
#define MOD 1000000007
#define INF (1LL<<25)     //33554432
#define PI 3.14159265359
#define EPS 1e-12
//#define int ll

signed main(void)
{
  string s;
  cin >> s;

  int a = 0, b = 0;
  REP(i, s.size()) {
    if(s[i] == 'O') {
      a++;
      b = 0;
    } else {
      b++;
      a = 0;
    }
    if(a == 3) {
      cout << "East" << endl;
      return 0;
    } else if(b == 3) {
      cout << "West" << endl;
      return 0;
    }
  }

  cout << "NA" << endl;
  return 0;
}