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: ['r', '3537', 'T', '3611', 'k', '4983', 'h', '4317', '8727', 'E', '6471', '8465', 'f', '5429', 'T', '2169', '2171', 'P', '6941', 'D']

A: 56821
****
Q: ['2765', '6767', '7645']

A: 17177
****
Q: ['J', '2447', 'R', 'M', 'R', '3201', '2335', 's', 'u', '6225', 'l', '7671', 'd', 'n', '1129', 's', '3011', '5313', '2291', 'l']

A:
33623
****