README_EN.md

784. Letter Case Permutation

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Description

Given a string S, we can transform every letter individually to be lowercase or uppercase to create another string.  Return a list of all possible strings we could create.

Examples:

Input: S = "a1b2"

Output: ["a1b2", "a1B2", "A1b2", "A1B2"]



Input: S = "3z4"

Output: ["3z4", "3Z4"]



Input: S = "12345"

Output: ["12345"]

Note:

<li><code>S</code> will be a string with length between <code>1</code> and <code>12</code>.</li>

<li><code>S</code> will consist only of letters or digits.</li>

Solutions

Python3

Java

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