#include<iostream> #include<cstdio> #include<cmath> using namespace std; int main() { int a,b; bool x; int i,j; char c; cin>>a>>b; cin>>c; cin>>x; if(x) { for(i=1;i<=a;i++) { for(j=1;j<=b;j++) cout<<c; cout<<endl; } } else { for(i=1;i<=a;i++) { for(j=1;j<=b;j++) { if((i==1)||(i==a)||(j==1)||(j==b)) cout<<c; else cout<<" "; } cout<<endl; } } cout<<endl; return 0; }