Task: Program Execution
Input (English): 4, ['1785', '1569', '6241', 'O', 'p', 'z', '923', 'N', '5755', 'y', '4823', 'i', 'l', '7095', '6125', '4263', 'D', '693', 'y', 'w', 'q', '919', '3141', '1943', 'X']
Output (English): 1785, 1569, 6241, O