#include <iostream>
#include <algorithm>
#include <string>
#include <cstdio>
using namespace std;

int main()
{
    string s; cin >> s;

    int e = 0, w = 0;
    char t = '-';
    for (int i = 0; i < s.size(); i++) {
        if (s[i] != t) e = 0, w = 0;
        (s[i] == 'O' ? e : w) ++;
        t = s[i];
        if (e >= 3) return puts("East"), 0;
        if (w >= 3) return puts("West"), 0;
    }
    puts("NA");

    return 0;
}