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.

['6217', 'A', '1925', 'o', '1433']
9575

['N', '1337', 'C', 'T', '863', 'j', '2369', 'P', 'A', 'x', '5725', '2333', 'Q', '9149', 'Q', '8529', 'N']
30305

['m', '1613', 'K', '1369', '4497', 'r', 'f', 'd', '8451', '3229', 'h', 'Q', 'D', '9741', 'l']

28900