#include <iostream>
#include <cstdio>
#include <algorithm>
#include <cstdlib>
#include <cstring>

using namespace std;

#define FOR(i,a,b) for (int i = (a); i < (b); i++)
#define REP(i,n) FOR(i,0,n)

typedef long long ll;

int main(){
	char str[101];
	
	scanf("%s", str);
	
	int len;
	
	len = strlen(str);
	
	if (len < 3) cout << "NA" << endl;
	
	FOR(i,2,len){
		if (str[i] == str[i-1] && str[i] == str[i-2]){
			if (str[i] == 'O') cout << "East" << endl;
			else cout << "West" << endl;
			
			break;
		}
		if (i == len-1) cout << "NA" << endl;
	}
	
	return 0;
}