A number is considered slidey if for every digit in the number, the next digit from that has an absolute difference of one. Check the examples below.

Examples

is_slidey(123454321) ➞ true

is_slidey(54345) ➞ true

is_slidey(987654321) ➞ true

is_slidey(1123) ➞ false

is_slidey(1357) ➞ false

Notes

• A number cannot slide properly if there is a "flat surface" (example #4), or has gaps (example #5).
• All single digit numbers can be considered slidey numbers!