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

template<class T>bool chmax(T &a, const T &b) { if (a<b) { a=b; return 1; } return 0; }
template<class T>bool chmin(T &a, const T &b) { if (b<a) { a=b; return 1; } return 0; }

#define FOR(i,a,b) for(ll i=(a);i<(b);++i)
#define ALL(v) (v).begin(), (v).end()
#define p(s) cout<<(s)<<endl
#define p2(s, t) cout << (s) << " " << (t) << endl
#define br() p("")
#define pn(s) cout << (#s) << " " << (s) << endl
#define p_yes() p("Yes")
#define p_no() p("No")

const ll mod = 1e9 + 7;
const ll inf = 1e18;

int main(){
    cin.tie(0);
    ios::sync_with_stdio(false);

    // input
    string s; cin >> s;
    ll a_win = 0;
    ll b_win = 0;

    for(char c : s){
        if(c=='O'){
            a_win++;
            b_win = 0;
        }else{
            b_win++;
            a_win = 0;
        }

        if(a_win==3){
            p("East");
            return 0;
        }
        if(b_win==3){
            p("West");
            return 0;
        }
    }
    p("NA");
    
    return 0;
}