#include <iostream> using namespace std; int main() { int h, w, fill; char c; cin >> h >> w >> c >> fill; for (int i = 0; i < h; i++) { for (int j = 0; j < w; j++) { if (fill == 1 || i == 0 || i == h-1 || j == 0 || j == w-1) { cout << c; } else { cout << " "; } } cout << endl; } return 0; }