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 (2.7.1) (judge verdict: Accepted)

#標準入力を取得
input = gets.split(" ").map(&:to_i)
from = input[0]
to = input[1]

#出力結果格納変数を定義
count = 0

#値の回文判定　fromからtoまで繰り返し
(from..to).each do |n|
  array = n.to_s.split("").map(&:to_i)
  if array[0] == array[4] && array[1] == array[3]
    count += 1
  end
end

#回答を出力
puts count