CF770A New Password

Innokentiy decides to change the password in the social net "Contact!", but he is too lazy to invent a new password by himself. That is why he needs your help. Innokentiy 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 Innokentiy and to invent a new password which will satisfy all given conditions.

The first line contains two positive integers $ n $ and $ k $ ( $ 2

Print any password which satisfies all conditions given by Innokentiy.

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.