Sim-siм
Medium
Execution time limit is 1 second
Runtime memory usage limit is 64 megabytes
How many times the number 7 in consecutive positive integers from A to B?
Input
The single line contains two positive integers A and B (1 ≤ A, B ≤ 10^9).
Output
A single number - the number of digits in seven consecutive positive integers from A to B.
Examples
Input #1
Answer #1
Submissions 553
Acceptance rate 12%