Task: Program Execution
Input (English): 7, ['4781', '3239', 't', 'n', '6497', 'e', '2477', 'I', 'O', 'F', 'W', '7507', '4971', '4475', 'r', '1429', '7655', '5575']
Output (English): I, O, F, W, 7507, 4971, 4475, r, 1429, 7655, 5575