9529: ABC222 —— A - Four Digits
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Description
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.
Print it as a four-digit string after appending to it the necessary number of leading zeros.
Input
Input is given from Standard Input in the following format:
```
$N$
```
```
$N$
```
Output
Print the answer.
Constraints
- $0 \leq N \leq 9999$
- $N$ is an integer.
- $N$ is an integer.
Sample 1 Input
321
Sample 1 Output
0321
321 has three digits, so we need to add one leading zero to it to make it have four digits.
Sample 2 Input
7777
Sample 2 Output
7777
Sample 3 Input
1
Sample 3 Output
0001