TASK DEFINITION: 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.
PROBLEM: ['2765', '6767', '7645']

SOLUTION: 17177

PROBLEM: ['P', '6299', '9655', 'l', '6317', '2139', '3347', 'l', '3095', '7363', '3115', '7529', 'R']

SOLUTION: 48859

PROBLEM: ['4937', '1371', 'E', '991', '4565', 'Y', '5291', 'Z', '621', '6189', 'q', '773', 'O', '8925', 'f', '5115', 'q']

SOLUTION:
38778