Consecutive Number Series

Write a function that will return True if a given string (divided and grouped into a size) will contain a set of consecutive numbers (regardless of orientation: whether ascending or descending), otherwise, return False.

Examples

is_consecutive("121314151617") ➞ True
# Contains a set of consecutive ascending numbers
# if grouped into 2's : 12, 13, 14, 15, 16, 17

is_consecutive("123124125") ➞ True
# Contains a set of consecutive ascending numbers
# if grouped into 3's : 123, 124, 125

is_consecutive("32332432536") ➞ False
# Regardless of the grouping size, the numbers can't be consecutive.

is_consecutive("326325324323") ➞ True
# Contains a set of consecutive descending numbers
# if grouped into 3's : 326, 325, 324, 323

is_consecutive("667666") ➞ True
# Consecutive descending numbers: 667 and 666.

is_consecutive("999897959493") ➞ False

Notes

• A number can consist of any number of digits, so long as the numbers are adjacent to each other, and the string has at least two of them.
• A recursive version of this challenge can be found via this link.