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).