Task: Program Execution
Input (English): 18, 21, ['A', 'O', '105', '4059', '1855', 'i', '6213', '3693', 'F', '891', '1991', 'o', 'u', 'C', 'g', 'U', 'c', '2149', '3979', 'B', 'S', '1069', 'p']
Output (English): 21493979BS