Given an array A of strings made only from lowercase letters, return a list of all characters that show up in all strings within the list (including duplicates). For example, if a character occurs 3 times in all strings but not 4 times, you need to include that character three times in the final answer. You may return the answer in any order. Example 1: Input: ["bella","label","roller"] Output: ["e","l","l"] Example 2: Input: ["cool","lock","cook"] Output: ["c","o"] Note: 1 <= A.length <= 100 1 <= A[i].length <= 100 A[i][j] is a lowercase letter