#include <iostream>
using namespace std;


int main(int argc, char** argv) {
    for (int j = 0; j < 20; j++){
    if ((j ==  0) || (j == 19))
        for (int i = 0; i  < 20; i++){
        cout << "*" ;

}
else {
        for (int i = 0; i  < 20; i++){
       if((i == 0) || (i == 19)) {

        cout << "*" ;
}
else {
    cout <<" ";
}
}
}
cout << endl;
}
    return 0;
}