Task: Program Execution
Input (English): 4, 5, ['5873', '3761', '867', 'q', 'f', 'j', '8531', 'O', 'V', '9307', '2145', '1025', 'N', '7137', 'I', '1337', '8967', '5857', 'g', 't']
Output (English): qf