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: ['5199', 'h', 'T', 'T', 'l', '1661', 'p']

SOLUTION: 6860

PROBLEM: ['I', 'n', '3069', '477', 'F', 'k', '847', '6777', 'N', 'X', 'F', '1417', '9445', 'o', 'v', 'd', '2169', 'w']

SOLUTION: 24201

PROBLEM: ['7533', '5015', 'J', '8223', '2285', 'P', 'i', 'W', '5663', 'k', '4959', 'l']

SOLUTION:
33678