Task: Program Execution
Input (English): 4, 5, ['m', '1857', 'z', 'O', '2287', 'r', 'X', '9017', 'f', '1857', '7473', 'O', 'b', 'C', 'k', 'v', 'r', '1051', '9437', '1391', 'd', '4591', '2713', '7121', '1611']
Output (English): O, f, C, 9437, 7121