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.

['D', '1259', '8927', '3345', '553', '7209', '2507', 'l', 'o', '7317', '1227', '6749', 'S', '3171', 'I', '197', '9577', 'j', 'Q']
52038

['R', '3361', 'c', 'S', 'g', '3829', '7347', '6633', 'e', '9227']
30397

['a', 'B', 't', 't', '8321', '3749', 'P', 'F', 'T', '2243', 'q', 'M', 'C', '111']

14424