Task: Program Execution
Input (English): 14, 21, ['y', '9743', 'N', 'c', '9967', '1009', 'z', 'i', 'u', 'B', '2765', '699', 'H', '8469', 'D', 'c', '8883', 'W', '7607', '1955', '3877']
Output (English): 8469Dc8883W760719553877