Task: Program Execution
Input (English): 1, 4, ['u', 'M', 'G', 'A', 'y', 'S', '1519', '2629', 'u', 's', '9685', 'c', '1181', '7381', '4791', 't', '2581', '6655', '3785', 'A', '8917', '7599', 'K', '9389', '157', 'U']
Output (English): uMGA