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)

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