Write it, run it, read the output

This is a scratch drill — your code runs, nothing is graded or recorded. No test cases, no expected output, no verdict.

TASK

In Java, use a mutable character buffer to scan "LeArnYard 7!" from left to right. Change uppercase letters to lowercase and lowercase letters to uppercase, leave the space, digit, and punctuation unchanged, then print the result.

lEaRNyARD 7!