# How many sixs?

Medium

Execution time limit is 1 second

Runtime memory usage limit is 122.174 megabytes

How many times will be written the digit 6 if to write sequentially all the positive integers from a to b?

## Input

Two positive integers a and b (1 ≤ a, b ≤ `10^9`

).

## Output

The number of 6 in sequentially written integers from a to b.

## Examples

Input #1

Answer #1

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