102410: [AtCoder]ABC241 A - Digit Machine

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

问题描述

有一个设备，屏幕上显示一个一位数，还有一个按钮。

当屏幕显示数字$k$时，按下按钮一次会将屏幕上的数字变为$a_k$。

该设备当前显示$0$。按下按钮$3$次后，屏幕上会显示什么？

约束条件

• $0\leq a_i \leq 9$
• 输入中的所有值都是整数。

输入

输入以标准输入的形式给出：

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

输出

输出答案。

样例输入1

9 0 1 2 3 4 5 6 7 8

样例输出1

7

屏幕上显示的数字依次变为$0 \rightarrow 9 \rightarrow 8 \rightarrow 7$。

样例输入2

4 8 8 8 0 8 8 8 8 8

样例输出2

4

屏幕上显示的数字依次变为$0 \rightarrow 4 \rightarrow 0 \rightarrow 4$。

样例输入3

0 0 0 0 0 0 0 0 0 0

样例输出3

0