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

struct cww{cww(){
    ios::sync_with_stdio(false);cin.tie(0);
}}star;
#define fin "\n"
#define FOR(i,bg,ed) for(int i=(bg);i<(ed);i++)
#define REP(i,n) FOR(i,0,n)
#define fi first
#define se second
#define pb push_back
#define DEBUG if(0)
template <typename T>inline void chmin(T &l,T r){l=min(l,r);}
template <typename T>inline void chmax(T &l,T r){l=max(l,r);}
template <typename T>
istream& operator>>(istream &is,vector<T> &v){
    for(auto &it:v)is>>it;
    return is;
}
    
int main(){
    string s;
    cin>>s;
    int N=s.size();
    char izryt='-';
    REP(i,N-2){
        if(s[i]==s[i+1]&&s[i+1]==s[i+2]){
            izryt=s[i];
            break;
        }
    }
    if(izryt=='X')cout<<"West"<<endl;
    if(izryt=='O')cout<<"East"<<endl;
    if(izryt=='-')cout<<"NA"<<endl;

    return 0;
}