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