Task: Program Execution
Input (English): 1, 18, ['y', '3835', 'Z', '6157', 'x', '6107', 'R', '5373', 'c', 'x', '6299', 'W', '1041', 'M', 'y', '1063', '1031', 'a']
Output (English): y3835Z6157x6107R5373cx6299W1041My10631031a