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?

Input

Input is given from Standard Input in the following format:
$a_0 a_1 \dots a_9$

Output

Print the answer.

Constraints

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

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

见题面 Input 部分

见题面 Output 部分