Task: Program Execution
Input (English): 7, 15, ['b', '1351', 'c', 'g', 's', '3579', '5161', '3523', 'E', '3477', 'v', '2987', 'W', '9381', 'L', '8949', '5505', '1869', '5237', '699', 'v', 'N', 'u']
Output (English): 51613523E3477v2987W9381L