#include<bits/stdc++.h> 
using namespace std;
int main(){
	long long q,w,e,t=1,y=1,p=1;
	char u;
	cin>>q>>w>>u>>e;
	while(t<=w){
	cout<<u;t++;
	}cout<<'\n';
	if(e==0){
	for(;y<=(w-2);y++){if(q==1) break;
	cout<<u<<setw(w-1)<<u<<'\n';}
	if(w==1) {for(int c=1;c<=q-2;c++) {cout<<u<<'\n';}}
	}
	if(e==1){
	while(p<=q-2)
	{if(q==1) break;t=1;
	while(t<=w)
	{cout<<u;t++;}cout<<'\n';p++;}
	}
	t=1;while(t<=w){if(q==1) break;
	cout<<u;t++;}
	cout<<'\n';
	 return 0;
}