#include<iostream>
#include<conio.h>
using namespace std;
int main()
{

char i,j,ch;
cout<<endl<<endl;
cout<<"*****************************************************************************";
cout<<endl<<endl;
cout<<"ENTER LAST ALPHABET:";
cin>>ch;
for(i=(int)'a';i<=int(ch);i++)
{
for(j='a';j<=i;j++)
{
cout<<j;
}
cout<<endl;
}
cout<<"\n*****************************************************************************";
getch();
return 0;
}