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Score : $100$ points

### 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:

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


### 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