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 = 27
**Output:** "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 = 73
**Output:** "aaszz"

**Constraints:**

1 <= n <= 105

n <= k <= 26 * n

**Solution:**

```
class Solution {
public String getSmallestString(int n, int k) {
char res[] = new char[n];
Arrays.fill(res, 'a');
k -= n;
while(k > 0){
res[--n] += Math.min(25, k);
k -= Math.min(25, k);
}
return String.valueOf(res);
}
}
```

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