The function takes a string as input and performs the following operations: 
- It replaces each letter with the corresponding letter from the end of the alphabet (e.g., 'a' becomes 'z', 'b' becomes 'y', etc.).
- It reverses the string.
- It replaces each digit with its reverse (e.g., '0' becomes '0', '1' becomes '1', '2' becomes '2', etc.).

