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 in the same order as they appear in the list A.
PROBLEM: ['8511', '4719', 'D', '8923', '845', 'L', '7159', '3361', '6927', '7631', 'T', 'k', '8403', '2267', '1889', '1227', 'D', 'P', '9403', '1555', 'c', 'Y', '8659', '7589', 'O', 'P', 'B', 'i', '871', '2789']

SOLUTION: 8511, 4719, 8923, 845, 7159, 3361, 6927, 7631, 8403, 2267, 1889, 1227, 9403, 1555, 8659, 7589, 871, 2789

PROBLEM: ['g', '9995', '3959', 'y', '1149', '3251', 'P', 'u', 'H', '4961', '4963', 'N', 'C', '9181', '757', 'u', 'K', '5583', '2507', 'q', 'l', '171', '2643', 'T', '1449', 'u', '175', 'e', '5941', '5565']

SOLUTION: 9995, 3959, 1149, 3251, 4961, 4963, 9181, 757, 5583, 2507, 171, 2643, 1449, 175, 5941, 5565

PROBLEM: ['6991', '455', 'P', '5953', 'f', 'i', '7649', '3957', 'P', 'B', '7715', '347', 'F']

SOLUTION:
6991, 455, 5953, 7649, 3957, 7715, 347