In the natural numbers range from 10 000 to 100 000 how many numbers satisfy the condition: its digits in left to right order are incremental.

Examples:

- Number 12348 satisfies the above condition because 1 <2 <3 <4 <8;

- Number 22345 is not satisfied because the first digit (2) and the second digit (2) are equal

- Number 12354 is not satisfied because of the sequence of digits 1; 2 ; 3; 5; 4 is not a rising sequence. (5> 4)