#include <iostream>
using namespace std;
int main() {
// your code goes here
int s,i,n=5,j;
char a='A';
s=0;
for(i=1;i<=n;i++){
a='A';
for(j=1;j+i<2*n&&i+j>n;j++){
a= 'A' + s;
cout<<a;
s++;
s=s%5;
}
cout<<"\n";
}
return 0;
}
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