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 Lua (5.3.2) (judge verdict: Accepted)

local a, b = io.read("*n", "*n")
local c = 0
for i = a, b do
  local s = tostring(i)
  if s:sub(1, 1) == s:sub(5, 5)
  and s:sub(2, 2) == s:sub(4, 4) then
    c = c + 1
  end
end
print(c)