Score : $100$ points

问题陈述

存在一个带有屏幕的设备，屏幕上显示一个单个数字，并带有一个按钮。

当屏幕显示出数字 $k$ 时，按下按钮一次会将屏幕上的数字更改为 $a_k$。

当前设备显示的是数字 $0$。在连续按压按钮三次后，屏幕上将会显示什么内容？

以上为通义千问 qwen-max 翻译，仅供参考。

Problem Statement

There is a device with a screen that shows a single-digit number, and a button.

When the screen is showing a number $k$, pressing the button once changes the number on the screen to $a_k$.

The device currently shows $0$. After pressing the button $3$ times, what will be shown on the screen?

Constraints

• $0\leq a_i \leq 9$
• All values in input are integers.

Input

Input is given from Standard Input in the following format:

$a_0$ $a_1$ $\dots$ $a_9$

Output

Print the answer.

Sample Input 1

9 0 1 2 3 4 5 6 7 8

Sample Output 1

7

The number on the screen transitions as $0 \rightarrow 9 \rightarrow 8 \rightarrow 7$.

Sample Input 2

4 8 8 8 0 8 8 8 8 8

Sample Output 2

4

The number on the screen transitions as $0 \rightarrow 4 \rightarrow 0 \rightarrow 4$.

Sample Input 3

0 0 0 0 0 0 0 0 0 0

Sample Output 3

0

update @ 2024/3/10 10:22:44