Problem:
Score : 100 points

Problem Statement

You are given a three-digit positive integer N.

Determine whether N is a palindromic number.

Here, a palindromic number is an integer that reads the same backward as forward in decimal notation.

Constraints

100≤N≤999

N is an integer.

Input

Input is given from Standard Input in the following format:

N

Output

If N is a palindromic number, print Yes; otherwise, print No.

Sample Input 1

575

Sample Output 1

Yes

N=575 is also 575 when read backward, so it is a palindromic number. You should print Yes.

Sample Input 2

123

Sample Output 2

No

N=123 becomes 321 when read backward, so it is not a palindromic number. You should print No.

Sample Input 3

812

Sample Output 3

No

Solution in Ruby (2.3.3) (judge verdict: Runtime Error)

a, b, c, d = gets.chomp.split.map(&:to_i)

arr1 = Array.new(100, 0)
arr2 = Array.new(100, 0)
a.upto(b - 1){|i| arr1[i] = 1}
c.upto(d - 1){|i| arr2[i] = 1}

count = 0
arr1.zip(arr2){|i, j| count += i * j}
puts count