#include<iostream>
#include<string>
#include<vector>
#include<set>
#include<algorithm>
#include<queue>
#include<functional>
#include<numeric>
#include<sstream>
#include<math.h>
#include <iomanip>
#define ll long long
#define PLL pair<ll,ll>
#define VS vector<string>
#define VL vector<ll>
#define VB vector<bool>
#define VPLL vector<pair<ll,ll> >
#define VVL vector<vector<ll> >
#define VVVL vector<vector<vector<ll> > >
#define VVB vector<vector<bool> >
#define rep(i,a) for (ll i=0;i<a;i++)
#define nrep(i,n,a) for (ll i=n;i<a;i++)
#define mrep(i,a) for(ll i=a;i>=0;i--)
#define INF 1000000000000000000
#define PI 3.141592653589793238
#define vmin(vec) *std::min_element(vec.begin(),vec.end())
#define vmax(vec) *std::max_element(vec.begin(),vec.end())
#define vsum(vec) std::accumulate(vec.begin(),vec.end(),0LL)
#define ksort(vec) sort(vec.begin(), vec.end(), greater<ll>())
#define ssort(vec) (vec.begin(),vec.end())
#define VPLLsort(vec) sort(vec.begin(), vec.end(),[](PLL &a, PLL &b){ return a.first < b.first; });
#define LTS(n) to_string(n)
#define STL(str) stoll(str)
using namespace std;


int main() {
	string s;
	cin >> s;
	if (s.size() < 3){
		cout << "NA" << endl;
		return 0;
	}
	rep(i, s.size()-2){
		if (s[i] == s[i + 1] &&s[i+1]== s[i + 2]){
			if (s[i] == 'O'){
				cout << "East" << endl;
				return 0;
			}
			else{
				cout << "West" << endl;
				return 0;
			}
		}
	}cout << "NA" << endl;
	return 0;
}