Task: Program Execution
Input (English): 19, 21, ['E', '2249', 'E', '9871', 'Z', 'n', 'R', '7307', 'B', 'P', 'G', '6577', 'y', 'm', '161', '8073', '6461', '333', '3033', 'u', 'b']
Output (English): 3033ub