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: ['X', '989', 'U', '9551', '6385', 'Y', '1433', 'J', '1833', '685', 'u']

A: 20876
****
Q: ['s', '407', '7983', '1523', '8983', '9841', 'p', 'y', 'N', '7633', 'T', '4177', 'Z', 'Y', '3223', '7125', '2601', '7467', '3039']

A: 64002
****
Q: ['I', '1621', '6959', 'E', 'K', 'r', '5491', 'H', 'D', '8267', '4261', '361', 't']

A:
26960
****