Task: Program Execution
Input (English): 1, 5, ['7511', '5733', 'M', '1759', '2987', 'd', '5107', '3913', '9537', 'a', 'q', '2837', '4189', '3569', 'a', '7411', '5857']
Output (English): 7511, d, q, 7411