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 = $stdin.gets.chomp.split(' ').map(&:to_i)

sum = [B/100 - A/100 - 1, 0].max

strA = A.to_s
cand = (strA[0..2] + strA[1] + strA[0]).to_i
if A <= cand && cand <= B
    sum += 1
end

strB = B.to_s
cand = (strB[0..2] + strB[1] + strB[0]).to_i
if A <= cand && cand <= B
    sum += 1
end

print sum