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)

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

counter = 0
(1..9).each do |i|
  (0..9).each do |j|
    (0..9).each do |k|
      num = %W(#{i}#{j}#{k}#{j}#{i}).join.to_i
      counter = counter.next if num.between?(a, b)
    end
  end
end

puts counter