Task: Program Execution
Input (English): 10, 20, ['7867', '1373', 'O', 'X', '2807', 'C', 'Q', 'I', 'P', '1531', '5945', '7063', 'O', 'u', '4125', 'P', '3453', 'F', '5055', 'V', '6337', 'a', 'b', 'Y']
Output (English): V5505F3543P5214uO360754951351