Normalize the Imported Codes

Basic

A legacy feed sends product codes in mixed case. Downstream matching is case-sensitive, so every code has to be normalized to upper case first.

Implement `solve(String input)` to return `input` converted to upper case.

Examples

Input"hello world"

Output"HELLO WORLD"

Input"ApEx"

Output"APEX"

Hints

String has a toUpperCase() method.

Anonymous Apex

String solve(String input) {
    // return input in upper case
    return null;
}

Your code runs in a secure sandbox against multiple hidden test cases. The problem is solved only when every test passes. Each run is isolated and any data changes are rolled back automatically.