# 2019 IUSB Programming Competition
# Round 1 Problem 2
# Check if a string is a palindrome
# Solution by Dana Vrajitoru
# Uses Python 3.6.2

import string

# Strips whitespaces and punctuation from a string and converts to lowercase
def stripSpacePunct(text):
    result = ""
    for c in text:
        if not (c in string.punctuation) and not (c in string.whitespace):
            result = result + c.lower()
    return result

# Checks if the string is a palindrome
def isPalindrome(text):
    n = len(text)
    for i in range(int(n/2)):
        if text[i] != text[n-i-1]:
            return False
    return True

# Testing the function
if __name__ == '__main__':
    print("Enter a string:")
    str = input()
    if isPalindrome(stripSpacePunct(str)):
        print("yes")
    else:
        print("no")