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: ['5499', '39', 'Q', 'b', 'W', '7155', '2515']

A: 15208
****
Q: ['W', '4453', '5895', 'Z', 'A', '7663', '2749', 'f', 'H', '6917', '1215', 'M', '1775', '5397', 'l', '8197', '5209', '8229', 'U']

A: 57699
****
Q: ['7243', 'p', '1105', 'z', '6507', '2635', 'Q', '1335', 'c', 'E', '6859', 'E', '7867', 'D', '8393', 's']

A:
41944
****