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)
#p a                                                                                       
#p b                                                                                       

n = 0

# 安直に全探索                                                                             
[*1..9].each{|x|
  [*0..9].each{|y|
    [*0..9].each{|z|
      tmp = 10001 * x + 1010 * y + 100 * z
      n += 1 if a <= tmp and tmp <= b
    }
  }
}

puts n