Sum of Digits of String After Convert

Description

You are given a string s consisting of lowercase English letters, and an integer k. Your task is to convert the string into an integer by a special process, and then transform it by summing its digits repeatedly k times. More specifically, perform the following steps:

- Convert s into an integer by replacing each letter with its position in the alphabet (i.e. replace 'a' with 1, 'b' with 2, ..., 'z' with 26).

- Transform the integer by replacing it with the sum of its digits.

- Repeat the transform operation (step 2) k times in total.

For example, if s = "zbax" and k = 2, then the resulting integer would be 8 by the following operations:

- Convert: "zbax" ➝ "(26)(2)(1)(24)" ➝ "262124" ➝ 262124

- Transform #1: 262124 ➝ 2 + 6 + 2 + 1 + 2 + 4 ➝ 17

- Transform #2: 17 ➝ 1 + 7 ➝ 8

Return the resulting integer after performing the operations described above.