Kata

I want to know the size of the longest consecutive elements of X in Y. You will receive two arguments: items and key. Return the length of the longest segment of consecutive keys in the given items.

Notes:

• The items and the key will be either an integer or a string (consisting of letters only)
• If the key does not appear in the items, return 0

Examples

90000, 0           -->  4
"abcdaaadse", "a"  -->  3
"abcdaaadse", "z"  -->  0