Palindrome check

Problem

Write a recursive function that tells whether a word reads the same forwards and backwards. Print yes or no.

Example 1

Input

level

Output

yes

A palindrome.

Example 2

Input

market

Output

no

Not a palindrome.

Try the problem first. Open one hint at a time.

Hint 1

Compare the first and last letters.

Hint 2

If they match, check the letters between them.

Write your Python code, run it on the examples and submit it to hidden tests.