## 01 Jun Friday 17:00 Python Practice 21.05.28.

**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 1

30Sample Output 1

30Sample Input 2

102Sample Output 2

210Sample Input 3

2931Sample Output 3

-1

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