#917

Reverse Only Letters

easy · verified · 68.2% accepted · 2,440 likes · top 75%

two pointers · string

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Description

Given a string s, reverse the string according to the following rules:

 - All the characters that are not English letters remain in the same position.

 - All the English letters (lowercase or uppercase) should be reversed.

Return s after reversing it.

Example 1:

Input: s = "ab-cd"
Output: "dc-ba"

Example 2:

Input: s = "a-bC-dEf-ghIj"
Output: "j-Ih-gfE-dCba"

Example 3:

Input: s = "Test1ng-Leet=code-Q!"
Output: "Qedo1ct-eeLg=ntse-T!"

Solution