### Problem Statement

Rick firmly believes that there are magical patterns related to some numbers. This belief is the result of his own tendency to find odd patterns everywhere. He has recently thought that some numbers have a "magical source". For example, the number 1371110974 has a magical source equal to 1234 because of the following process:

```        1234
+      12340
+     123400
+    1234000
+   12340000
+  123400000
+ 1234000000
------------
1371110974
```
Formally, 1234 is a magical source of 1371110974 because there exists a number n such that the sum of a sequence of n numbers, where the i-th number (0-indexed) is 1234 multipled by 10^i, is equal to 1371110974. Note that by this definition, a positive number is a magical source of itself.

Given a positive long x, return its minimum positive magical source.

### Definition

 Class: MagicalSource Method: calculate Parameters: long Returns: long Method signature: long calculate(long x) (be sure your method is public)

### Constraints

-x will be between 1 and 1000000000000 (10^12), inclusive.

### Examples

0)

 `1371110974`
`Returns: 1234`
 This is the example from the statement.
1)

 `111111`
`Returns: 1`
2)

 `10989`
`Returns: 99`
3)

 `120`
`Returns: 120`
 Note that a number is always a magical source of itself.
4)

 `109999999989`
`Returns: 99`

#### Problem url:

http://www.topcoder.com/stat?c=problem_statement&pm=10635

#### Problem stats url:

http://www.topcoder.com/tc?module=ProblemDetail&rd=13905&pm=10635

vexorian

#### Testers:

PabloGilberto , bmerry , ivan_metelsky

#### Problem categories:

Math, Simple Math, Simple Search, Iteration