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.

Q: ['d', '5571', '6455', '4287', 'I', 'U', 'M', '8303', '8893']

A: 33509
****
Q: ['u', 'e', 'P', 'D', '255', '2573', 'E', 'P', 's', '3725', '3391', 'I', '5323', '885']

A: 16152
****
Q: ['r', '9889', 'j', 'T', '3933', '3497', 'N', '8831', '4859', 'u', '2659', 'T', '6437', 'r']

A:
40105
****