# Programming contests

## DEIK Regionális Programozó Csapatverseny, egyetemi kategória, 2022. december 4.

December 4, 2022 10:00 AM – December 4, 2022 3:15 PM

# stepping

An integer (represented in base `10`) is called stepping if the adjacent digits have absolute difference of 1. Any single digit number is stepping by definition. For example: each of the numbers `9,123,321,101,676` is stepping, but none of `42,122,329,111,69654` is. Compute all of the stepping numbers in the interval `[A,B]`!

## Example

```A=10
B=20
It is easy to see that except `10,12` there are no more stepping
numbers in the interval.
```

## Input Specification

```A B
```

A single line with space separated the integers `1 ≤ A ≤ B ≤ 2*109 `.

## Output Specification

``````
[s1,...,sk]
```
```

A line with the `comma` searated, square bracket enclosed list of stepping numbers. The numbers must be in increasing order!

## Sample Input 1

1. `10 20`

## Sample Output 1

1. `[10,12]`

## Sample Input 2

1. `100 300`

## Sample Output 2

1. `[101,121,123,210,212,232,234]`
1. `99 100`
1. `[]`