Problem:
Score : 200 points

Problem Statement

Find the number of palindromic numbers among the integers between A and B (inclusive).
Here, a palindromic number is a positive integer whose string representation in base 10 (without leading zeros) reads the same forward and backward.

Constraints

10000 \leq A \leq B \leq 99999

All input values are integers.

Input

Input is given from Standard Input in the following format:

A B

Output

Print the number of palindromic numbers among the integers between A and B (inclusive).

Sample Input 1

11009 11332

Sample Output 1

4

There are four integers that satisfy the conditions: 11011, 11111, 11211 and 11311.

Sample Input 2

31415 92653

Sample Output 2

612

Solution in Ruby (2.3.3) (judge verdict: Accepted)

def judge(num)
  a = num / 10000
  b = num / 1000 % 10
  c = num / 10 % 10
  d = num % 10
  a == d && b == c
end

a, b = gets.split(' ').map(&:to_i)
ret = 0
(a..b).each do |num|
  ret += 1 if judge(num)
end
puts ret