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.

['P', '6161', 'k', '5925', 'h', 'G', 'n']
12086

['c', 'r', 'R', 'a', '6915', 'C', '3651', 'j', 'L', '9761', '2923', 'Z', 'e', '833', 'W', '1867', 'G', 'H', 'T']
25950

['O', '3081', 'N', '8295', 'V', 'R', 'l', '8171', '1465', '5679', '9987', '525', '3603', 'd', 'q', '3655', '4215']

48676