#include<bits/stdc++.h>
using namespace std;

#define int long long

typedef pair<int,int>pint;
typedef vector<int>vint;
typedef vector<pint>vpint;
#define pb push_back
#define mp make_pair
#define fi first
#define se second
#define all(v) (v).begin(),(v).end()
#define rep(i,n) for(int i=0;i<(n);i++)
#define reps(i,f,n) for(int i=(f);i<(n);i++)
#define each(it,v) for(__typeof((v).begin()) it=(v).begin();it!=(v).end();it++)
template<class T,class U>void chmin(T &t,U f){if(t>f)t=f;}
template<class T,class U>void chmax(T &t,U f){if(t<f)t=f;}

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