Task: Program Execution
Input (English): 18, 21, ['9651', '1765', 'c', 'd', 'e', 'P', '3913', '313', '851', '8035', '327', '5209', 'U', 'Q', '3655', 'c', '6139', '3867', 'g', '8679', '8241', '6611', 'I', '9819', '9199']
Output (English): 3867, g, 8679, 8241