Task: Program Execution
Input (English): 18, 19, ['9409', 'U', 'i', '5801', '5147', 'J', '7039', '9011', '2467', 'R', '6013', '2085', '5303', '8701', '8509', '3885', 'U', '8087', 'r', '8197', 'J', 'i', '2979']
Output (English): r7808