In this task, you are given an input list A. You need to find all the elements of the list that are numbers and calculate their sum.

Example Input: ['2895', '8095', 'y', '1927', '4827']
Example Output: 17744

Example Input: ['q', 'I', 'E', 'M', 'T', 'i', '8719', 'r', 'V', '9759', 'I', '1793', 'Q', 'P', '5263', 'I', 'O', '8603', 'y']
Example Output: 34137

Example Input: ['M', 'Z', 'c', '6431', 'f', '385', 'b', 'd', '8259']
Example Output:
15075