正解！！！

#include<bits/stdc++.h>

using namespace std;

int main() {

char b;

cin>>b;

cout<<"  "<<b<<endl;

cout<<" "<<b<<b<<b<<endl;

cout<<b<<b<<b<<b<<b<<endl;

cout<<" "<<b<<b<<b<<endl;

cout<<"  "<<b;

}
```