Question
Given a string s
, you can transform every letter individually to be lowercase or uppercase to create another string.
Return a list of all possible strings we could create. Return the output in any order.
Example 1:
Input: s = "a1b2" Output: ["a1b2","a1B2","A1b2","A1B2"]
Example 2:
Input: s = "3z4" Output: ["3z4","3Z4"]
Constraints:
1 <= s.length <= 12
s
consists of lowercase English letters, uppercase English letters, and digits.
Python Solution
class Solution: def letterCasePermutation(self, s: str) -> List[str]: r=[''] for ch in s: if ch.isalpha(): r = [i+j for i in r for j in [ch.upper(),ch.lower()]] else: r = [i+ch for i in r] return(r)