## 17 Oct Tuesday Python Homework 18:30 – 22.10.11.

**Question:**

One morning, completely by chance, Mirko found a positive integer N in the middle of the street. Since Mirko adores the number 30, he wants to know the maximum multiple of the number 30 that can be obtained by shuffling the digits of the number he found in the street. Help our hero and write a program that calculates that number (if it exists).

**Input Specification**

The first and only line of input contains the integer N, consisting of at most 105 digits.

**Output Specification**

The first and only line of output must contain the required number from the task, if it exists. If it doesn’t exist, output -1.

Sample Input 130Sample Output 130Sample Input 2102Sample Output 2210Sample Input 32931Sample Output 3-1

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