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.

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).

Constraints

• $10000 \leq A \leq B \leq 99999$
• All input values are integers.

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

见题面 Input 部分

见题面 Output 部分