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: ['9069', '8333', 'H', '2049', '8051', 'L', '2749', '8819', '2883', '9317', 'M', '6515']

SOLUTION: 57785

PROBLEM: ['l', '2511', '2071', 'o', 'F', '7583', '1909', '1859', '3299', '3853', 'h', 'P', 'P', '9175', 'B', 'F']

SOLUTION: 32260

PROBLEM: ['7003', '571', 'x', '2159', '131', '2751', 'a', 'E', 'E', 'n', 'J', 'p', 't', '4469', '7427']

SOLUTION:
24511