Leetcode Problem 917. Reverse Only Letters

917. Reverse Only Letters

Leetcode Solutions

Initialize an empty stack to hold the English letters.
Iterate through each character in the input string s.
- If the character is an English letter (checked using a helper function), push it onto the stack.
Initialize an empty list to build the result string.
Iterate through each character in the input string s again.
- If the character is an English letter, pop a letter from the stack and append it to the result list.
- If the character is not an English letter, append the original character to the result list.
Join the result list into a string and return it.

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