Task: Program Execution
Input (English): 11, 20, ['W', 'D', 'U', '7803', '7827', '4949', 'U', 'm', 'r', 'h', '987', '3909', 'd', 'm', '5569', 'j', '881', 'd', '8399', 'Y', '9377', 'h', 'l', '6327']
Output (English): 9873909dm5569j881d8399Y