Task: Program Execution
Input (English): 19, 20, ['d', '6831', 'u', '1115', '9665', 'i', '6205', '1981', 'D', 'b', '825', '9285', 'u', '2865', 'A', 'f', 'H', 'S', '9937', 'A', '2807', '7867', '1389', '5625', 'G', '9353']
Output (English): A9937