# Home

Score : $100$ points

### Problem Statement

You are given an integer $N$ between $0$ and $9999$ (inclusive).

Print it as a four-digit string after appending to it the necessary number of leading zeros.

### Constraints

• $0 \leq N \leq 9999$
• $N$ is an integer.

### Input

Input is given from Standard Input in the following format:

$N$


### Sample Input 1

321


### Sample Output 1

0321


$321$ has three digits, so we need to add one leading zero to it to make it have four digits.

### Sample Input 2

7777


### Sample Output 2

7777


### Sample Input 3

1


### Sample Output 3

0001