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#include <bits/stdc++.h>
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 (j == 0 || j == w - 1 || i == 0 || i == h - 1)
cout << c;
else if (fill) {
cout << c;
} else {
cout << ' ';
}
}
cout << endl;
}
return 0;
}