420. Number Permutations
Time limit per test: 0.75
second(s)
Memory limit: 262144
kilobytes
input: standard
output: standard
Two distinct positive integer numbers with decimal notations of the same length are called
similar, if their decimal notations can be obtained from each other by permuting the digits.
How many numbers from the segment [l,
r] have exactly one similar number in that segment?
Input
The input file contains two integer numbers
l and
r (1 ≤
l ≤
r ≤ 10
^{15}).
Output
Output one integer number — the sought amount.
Example(s)
sample input

sample output

10 99

72
