#include <iostream> int a, b, f; char c; int main() { scanf("%d %d %c %d", &a, &b, &c, &f); for (int i = 0; i < a; i++){ for (int j = 0; j < b; j++){ if (i != 0 && i != a - 1 && j != 0 && j != b - 1) printf("%c", f == 0?' ':c); else printf("%c", c); } printf("\n"); } return 0; }