Task: Program Execution
Input (English): 8, 9, ['g', 'O', '2007', 'Y', 'w', '4773', 'Z', 'b', 'f', 'y', 'n', '531', '7035', 'O', 'Q', 'k', 'R', '4521', '1929', '8309', 'x']
Output (English): fb