102220: [AtCoder]ABC222 A - Four Digits

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:

$N$

Output

Print the answer.

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

问题描述

你将得到一个在0到9999（含）之间的整数N。

将它打印为一个四位字符串，前面补足必要数量的前导零。

限制条件

• $0 \leq N \leq 9999$
• N是一个整数。

输入

输入以以下格式从标准输入给出：

$N$

输出

打印答案。

样例输入1

321

样例输出1

0321

$321$有三位数字，所以我们需要给它添加一个前导零以使其有四位数字。

样例输入2

7777

样例输出2

7777

样例输入3

1

样例输出3

0001