？？？

#include using namespace std;

int main() {
int h, w;
char s;
int id; cin >> h >> w >> s >> id; for (int i = 0; i < h; i++) {
for (int j = 0; j < w; j++) { if (id == 1) { cout << s;
} else { if (i == 0 || i == h - 1 || j == 0 || j == w - 1) { cout << s;
} else { cout << ' ';
}
}
} cout << endl;
}

return 0;  

}