As a child, I liked to play a game of guessing numbers, also known as Cows and Bulls. In the beginning, one party chose four different digits, such as (1, 2, 3, 5), as the secret number. Then the other tries to guess the secret number, for example, supposing the guessed number as (4, 3, 8, 5). The first one responds with “1A1B”, which indicates that one matching digit is in its right position, it is an A (the digit 5), and one matching digit is in its different position, it is a B (the digit 3). This try and response continue until the secret number is revealed. Please write a program to simulate this guessing process, and the default secret number is defined as (4, 8, 0, 1).

小時候常玩一種猜數字的遊戲，開始時由一方選擇四個相異的數字，例如 (1, 2, 3, 5) 。接著由另外一方猜測，例如猜數字 (4, 3, 8, 5) ，對方則回應 1A 1B ，表示一個數字猜對且位置正確（一個A，即數字 5 ），另一數字猜對但位置不對（一個B，即數字 3 ）。請寫一個程式，模擬猜數字的進行。程式中內定這組數字 (4, 8, 0, 1) 供電腦玩家猜測。