#include<bits/stdc++.h>
using namespace std;
typedef long long ll;
#define F first
#define S second
#define pii pair<int, int>
#define eb emplace_back
#define all(v) v.begin(), v.end()
#define rep(i, n) for (int i = 0; i < n; ++i)
#define rep3(i, l, n) for (int i = l; i < n; ++i)
#define chmax(a, b) a = (a >= b ? a : b)
#define chmin(a, b) a = (a <= b ? a : b)
#define out(a) cout << a << endl
#define outa(a, n) rep(_, n) cout << a[_] << " "; cout << endl
#define SZ(v) (int)v.size()
#define inf (int)(1e9+7)
#define abs(x) (x >= 0 ? x : -(x))

pii specify(string str, string target) {
    rep(i, SZ(str)) {
        rep(j, SZ(target)) {
            if (str[i + j] != target[j]) break;
            if (j == SZ(target) - 1) {
                return {i, i + j};
            }
        }
    }
    return {1e9 + 7, 1e9 + 7};
}
int main() {
    ios::sync_with_stdio(false);
    cin.tie(0);
    string str;
    cin >> str;
    pii a = specify(str, "OOO");
    pii b = specify(str, "XXX");
    if (a.F < b.F) out("East");
    else if (a.F > b.F) out("West");
    else out("NA");
}