#include <bits/stdc++.h>
#define rep(i,n) for(int i=0;i<(int)(n);i++)
using namespace std;
using ll = long long ;
using P = pair<int,int> ;
using pll = pair<long long,long long>;
constexpr int INF = 1e9;
constexpr long long LINF = 1e17;
constexpr ll MOD = 1000000007;
constexpr double PI = 3.14159265358979323846;

int main(){
    string s;
    cin >> s;
    string ans = "NA";
    bool o = true;
    int c = 0;
    rep(i,s.size()){
        if(s[i]=='O'&&o) ++c;
        else if(s[i]=='X'&&!o) ++c;
        else{
            o = !o;
            c = 1;
        }
        if(c==3){
            ans = (o?"East":"West");
            break;
        }
    }
    cout << ans << endl;
    return 0;
}