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Score : $100$ points

### Problem Statement

You are given a $3$-character string $S$, which is a concatenation of integers $a$ and $b$ between $1$ and $9$ (inclusive) and the character x in this order: axb.

Find the product of $a$ and $b$.

### Constraints

• The length of $S$ is $3$.
• The $1$-st and $3$-rd characters are digits between $1$ and $9$ (inclusive).
• The $2$-nd character is x.

### Input

Input is given from Standard Input in the following format:

$S$


### Sample Input 1

3x7


### Sample Output 1

21


We have $3 \times 7 = 21$, which should be printed.

### Sample Input 2

9x9


### Sample Output 2

81


### Sample Input 3

1x1


### Sample Output 3

1