LC3

I need a program to echo the user entered strings. I have write this code. but its not working properly. Please help me out.

I need to write a program in LC3 language which echoes users input and decide whether it is a "Palindrome" or not

example 1

user input = My name is red

Ouput should be = My name is red

String entered is not a Palindrome

example 2

user input= abccba

Output= abccba

String entered is a Palindrome

Please Help!