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: ['6565', 'T', 'O', '2901', '5121', 'y', '9617', 't', '7825']

SOLUTION: 32029

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

SOLUTION: 36146

PROBLEM: ['U', 'f', 'l', '6655', 'x', '1521', '8323', 'J', 'X', '1915', '8677', 'M', '2769', '7383', 'U', 'a']

SOLUTION:
37243