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