Task: Program Execution
Input (English): 4, 6, ['6173', 'C', '7007', '3079', '6821', 'f', 'd', '8443', 'S', 'o', '4765', '7', 'J', 'W', 'Q', 'f', 'K', '7465']
Output (English): 3079, 6821, f