Input: th [thing, awesome, potato, example]
Output: thing (Because it starts with "th")

Input: ing [thing, potato]
Output: thing (Because it ends with "ing")

Input: tat [thing, potato]
Output: potato (Because it contains "tat")

Input: tat [tato, potato]
Output: tato, potato (If there are 2 or more results matching, print all of them)