Task: Program Execution
Input (English): 12, 16, ['Q', '8455', '8911', 'B', '9467', 'W', '7861', '923', 'J', 'a', 'S', 'G', 'x', '9775', 'P', 'x', '4991', '9073', 'P', 'm', 'o', 'v']
Output (English): xP9775xG