#include <iostream>
#include <math.h>
#include <iomanip>
#include <string>
using namespace std;

int main()
{
    int x,n, y = 0 , u=0;
    string p, s , r[200];
    bool e;
    cin >> x;


    for (int i = 1; i <= x; i++){
        cin >> n;
        cin >> p;

        for (int j = 0; j <= n; j++){
            getline(cin, s);
            for (unsigned int i = 0; i < p.length(); i++){

                if (p[i] == s[i]){
                    e = true;

                }
                else{
                    e = false; break;
                }

            }
            if (e == true){
                y++;

                r[u] = s;
                u++;
            }

        }
        if (y > 0){
            cout << y << endl;
            for (int i = u; i >= 0; i--){
                cout << r[i] << endl;
            }
            y = 0;
            u = 0;
        }
        else cout << "Conan's assumption is wrong!" << endl;
    }
}