Task: Program Execution
Input (English): 1, 19, ['U', '967', 'F', '6911', '7979', '3799', '5993', 'y', '2421', 'X', 'B', '3241', 'f', '3519', '3307', 'U', 'f', '2801', '9103', '4673', 'Y', '5027', '943']
Output (English): 91032801fU33073519f3241BX2421y5993379979796911F967U