New Password

Xoan decides to change the password in the social net "Contact!", but she is too lazy to invent a new password by himself. That is why she needs your help.

Xoan decides that new password should satisfy the following conditions:

• the length of the password must be equal to ~n~,
• the password should consist only of lowercase Latin letters,
• the number of distinct symbols in the password must be equal to ~k~,
• any two consecutive symbols in the password must be distinct.

Your task is to help Xoan and to invent a new password which will satisfy all given conditions.

Input

• The first line contains two positive integers ~n~ and ~k~ \((2 \le n \le 100;\) \(2 \le k \le \min(n, 26))\) ~-~ the length of the password and the number of distinct symbols in it.

Output

• Print any password which satisfies all conditions given by Xoan. Pay attention that a desired new password always exists.

Samples

4 3

java

6 6

python

5 2

phphp

Clarification

In the first test there is one of the appropriate new passwords ~-~ java, because its length is equal to ~4~ and ~3~ distinct lowercase letters a, j and v are used in it.

In the second test there is one of the appropriate new passwords ~-~ python, because its length is equal to ~6~ and it consists of ~6~ distinct lowercase letters.

In the third test there is one of the appropriate new passwords ~-~ phphp, because its length is equal to ~5~ and ~2~ distinct lowercase letters p and h are used in it.

Pay attention the condition that no two identical symbols are consecutive is correct for all appropriate passwords in tests.