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The **numeric value** of a **lowercase character** is
defined as its position `(1-indexed)`

in the alphabet, so the numeric value
of `a`

is `1`

, the numeric value of `b`

is
`2`

, the numeric value of `c`

is `3`

, and so on.

The **numeric value** of a **string** consisting of
lowercase characters is defined as the sum of its characters' numeric values. For
example, the numeric value of the string `"abe"`

is equal to ```
1 + 2
+ 5 = 8
```

.

You are given two integers `n`

and `k`

. Return *the lexicographically
smallest string with length equal to *

`n`

and
numeric value equal to `k`

.Note that a string `x`

is lexicographically smaller than string
`y`

if `x`

comes before `y`

in dictionary order,
that is, either `x`

is a prefix of `y`

, or if `i`

is the first position such that `x[i] != y[i]`

, then `x[i]`

comes before `y[i]`

in alphabetic order.

**Example 1:**

Input:n = 3, k = 27Output:"aay"Explanation:The numeric value of the string is 1 + 1 + 25 = 27, and it is the smallest string with such a value and length equal to 3.

**Example 2:**

Input:n = 5, k = 73Output:"aaszz"

**Constraints:**

`1 <= n <= 10`

^{5}`n <= k <= 26 * n`

All contents and pictures on this website come from the Internet and are updated regularly every week. They are for personal study and research only, and should not be used for commercial purposes. Thank you for your cooperation.