Task: Program Execution
Input (English): 4, ['i', 'v', '531', '3137', 'U', '657', '1925', 'd', '5043', 'F', '1827', '6857', 'Y', '4007', 'R', 'B', '4069', '9117', '1823', '771', '1599']
Output (English): i, v, 531, 3137