#include<iostream>
using namespace std;
int main() {
	char c;
	int a,b,f;
	cin >> a >> b >> c >> f;
	if (f == 0) {
		for (int i = 1;i <= b;i++) {
			cout << c;
		}
		cout << endl;
		for (int i = 1;i <= a - 2;i++) {
			cout << c;
			for (int j = 1;j <= b - 2;j++) {
				cout << " ";
			}
			cout << c << endl;
		}
		for (int i = 1;i <= b;i++) {
			cout << c;
		}
	}
	else if (f == 1) {
		for (int i = 1;i <= b;i++) {
			for (int j = 1;j <= a;j++) {
				cout << c;
			}
			cout << endl;
		}
	}
	return 0;
}