Task: Program Execution
Input (English): 3, 15, ['7727', 'a', '677', '4795', 'W', 'Y', 'U', '4911', '2369', 'P', 'L', '4465', '7359', '8593', 'K', 'O', '8855', 'y']
Output (English): 6774795WYU49112369PL446573598593K