Task: Program Execution
Input (English): 15, 19, ['X', 'm', '8611', 'R', '999', 'M', '9499', '1539', 'J', '3841', '9071', '645', '3009', '3463', 'X', 'X', '9933', 'w', 'H', 'f', 'S', 'l', '8459', 'E', '5731']
Output (English): XX9933wH