#c++

Write a function (named "longest_letter_run") that takes two constant references to strings. It should return an int. The first string is a piece of text, and the second string is the letters that we are looking for runs in. A run is a series of consecutive letters from the second string.

Example:

This call:

longest_letter_run("this_is_some_text", "ais_")

Should return a 7 because the longest letter run is "is_is_s".