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.

Input

Input is given from Standard Input in the following format:
N

Output

Print the answer.

Constraints

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

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

见题面 Input 部分

见题面 Output 部分