#include<iostream> using namespace std; int main(){ int n,m,f; char ch; cin>>n>>m>>ch>>f; for(int i=0;i<n;i++){ for(int j=0;j<m;j++){ if(f==1){ cout<<ch; }else{ if(i!=0&&i!=n-1&&j!=0&&j!=m-1){ cout<<" "; }else{ cout<<ch; } } } cout<<endl; } return 0; }