#include<bits/stdc++.h>
#define rep(i,n) for(int i=0;i<(int)(n);i++)
using namespace std;

int main(){
    string s; cin >> s;
    if(s.size() < 3){
        printf("NA\n");
        return 0;
    }
    rep(i, s.size() - 2){
        if(s[i] == 'O' && s[i + 1] == 'O' && s[i + 2] == 'O'){
            printf("East\n");
            return 0;
        }
        if(s[i] == 'X' && s[i + 1] == 'X' && s[i + 2] == 'X'){
            printf("West\n");
            return 0;
        }
    }
    printf("NA\n");
    return 0;
}