#include <iostream>
using namespace std;
int main()
{
int i,j;
char input,temp='A';
cout<<"Enter uppercase character you want in triange at last row: ";
cin>>input;
for(i=1;i<=(input-'A'+1);++i)
{
for(j=1;j<=i;++j)
cout<<temp<<" ";
++temp;
cout<<endl;
}
return 0;
}