1288. Invert Case of All Characters in a String

Given a string, invert the case of every English letter (uppercase becomes lowercase and vice versa) while leaving all other characters unchanged. Toggle case with an XOR of 32 on letter codes.

Input: A JSON object {"s": <string>} containing printable ASCII characters.

Output: Return the case-inverted string.

Examples

Input: {"s":"Hello, World!"}
Output: hELLO, wORLD!
Explanation: Each letter flips case; punctuation stays -> 'hELLO, wORLD!'.

Input: {"s":"abcXYZ"}
Output: ABCxyz
Explanation: Lower becomes upper and upper becomes lower -> 'ABCxyz'.

Constraints

• 0 <= s.length <= 10^4
• s contains printable ASCII

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