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)

# 5桁固定なので1桁目と5桁目、2桁目と4桁目を比較して同じであればいい
a, b = gets.split.map{|i| i.to_i}
ans = 0
(a..b).each do |i|
    x, y = i%10, i/10000
    p, q = (i/10)%10, (i/1000)%10
    if x==y && p==q then
        ans+=1
    end
end

puts ans