995

#include <bits/stdc++.h>
using namespace std;
int main(){
	int a,b,f;
	char c;
	cin>>a>>b>>c>>f;
	for(int i=0;i<a;++i){
		for(int j=0;j<b;++j){
			cout<<((i==0||1==a-1||j==0||j==b-1)?c:(f==0)?' ':c);
		}
		cout<<endl;
	}
    return 0;
}

thanks!!!!!