Write an ARM program that does the following:

1. Prints "input a string"

2. Reads the input string

3. Calculates the length of the string

4. Outputs the string length to the console

5. Recursively determines if the string is a palindrome

6. Outputs whether the string is a palindrome

I've gotten steps 1-4 for the most part, but I'm stuck on step 5.