Task: Program Execution
Input (English): 17, 18, ['Q', '2949', 'k', 'o', 'Y', '6461', 'U', '5273', '2789', 'P', 'H', '669', '4233', 'r', 'd', 'A', 'C', '8835', '121', '6291', 'A']
Output (English): 5388C