答案

#include<bits/stdc++.h>
using namespace std;
int main(){
int a,b,d;
char c;
cin>>a>>b>>c>>d;
for(int i=0;i<a;i++){
for(int j=0;j<b;j++){
if(d1||j0||jb-1||
i0||i==a-1) cout<<c;
else cout<<" ";
}
cout<<endl;
}

return 0;

}