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Week 8: December 28 - January 10. Functions. Part 1

The minimal sum of digits

How many positive integers from interval [m, n] have the least sum of digits?

Input

Two integers m and n (1mn106).

Output

Print the amount of positive integers from interval [m, n] with minimum sum of digits.

Time limit 1 second
Memory limit 128 MiB
Input example #1
1 100
Output example #1
3