#include<iostream>
#include<algorithm>
#include<vector>
typedef long long int ll;
using namespace std;
int dp[500010];
int main(){
	string s; cin >>s;
	int cnt=0;
	if(s.size()<3){
		cout << "NA" << endl;
		return 0;
	}
	for(int i=0;i<s.size()-2;i++){
		if(s[i]=='O'&&s[i+1]=='O'&&s[i+2]=='O'){
			cout << "East" << endl;
			return 0;
		}
		if(s[i]=='X'&&s[i+1]=='X'&&s[i+2]=='X'){
			cout << "West" << endl;
			return 0;
		}
	}
	cout << "NA" << endl;
	return 0;
}