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Challenge

Using The Force, The Brute Force

In this challenge you will be a hacker trying to find out a password from a hash you got from a database.

During the database hacking you also got some extra information that will be very usefull to get this password:

- The password encryption is md5
- The maximum password length is 4 because it's a pin number
- The password can only have the following characters [a, b, c, 0, 1, 2, 3] (it's a weird pin pad)

Tip: Take a look at this article about Brute Force Attacks

Let the hacking begin!

Input Format
Each input will be a string with a hash like: "81b5dd04bf5cbc172eeb34bb8062fde1"

Output Format
The output should be a string with the password

Sample Input
81b5dd04bf5cbc172eeb34bb8062fde1

Sample Output
a23c

Memory Limit
512M


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