Task: Program Execution
Input (English): 15, 18, ['2615', 'U', '7537', '7541', '7011', 'a', '7921', 'f', 'T', '901', '5687', 'W', '713', 'm', 'e', '4365', '3287', '1', '6105', 'X', 'd']
Output (English): 7653