Problem Statement

You are given an integer K.
Print a string that is a concatenation of the first K uppercase English letters in ascending order, starting from A.

Input

The input is given from Standard Input in the following format:
K

Output

Print the answer.

Constraints

• K is an integer between 1 and 26, inclusive.

Sample Input 1

3

Sample Output 1

ABC

The uppercase English letters in ascending order are A, B, C, ...
By concatenating the first three uppercase English letters, we get ABC.

Sample Input 2

1

Sample Output 2

A

见题面 Input 部分

见题面 Output 部分