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: ['r', 'z', 'u', 'D', '3449', 'E', 'f', 'w', '1627', '4093', '955', 'i', 's', 'R', 'b', '9773', '2169', 'M', '9305', '4775']

SOLUTION: 36146

PROBLEM: ['8361', '6757', '5341', '2597', '9803', 'a', 'd', '5889', '9823', 'd', '7947', 'y', 'p']

SOLUTION: 56518

PROBLEM: ['q', 'd', '6521', '3831', '3435', '2953', '2211', '8931', 'j', 'L']

SOLUTION:
27882