Problem Statement   Fox Ciel thinks that the number 41312432 is interesting.
This is because of the following property:
There is exactly 1 digit between the two 1s, there are exactly 2 digits between the two 2s, and so on.
Formally, Ciel thinks that a number X is interesting if the following property is satisfied:
For each D between 0 and 9, inclusive, X either does not contain the digit D at all, or it contains exactly two digits D, and there are precisely D other digits between them.
You are given a String x that contains the digits of a positive integer.
Return "Interesting" if that integer is interesting, otherwise return "Not interesting".   Definition   Class:  InterestingNumber  Method:  isInteresting  Parameters:  String  Returns:  String  Method signature:  String isInteresting(String x)  (be sure your method is public) 
    Constraints    x will correspond to an integer between 1 and 1,000,000,000, inclusive.    x will not start with a '0'.   Examples  0)     Returns: "Interesting"  There are 0 digits between the two 0s, and 2 digits between the two 2s, so this is an interesting number. 

 1)     Returns: "Not interesting"  There should be 1 digit between the two 1s, but there are 2 digits between them. Hence, this number is not interesting. 

 2)     Returns: "Interesting"  This is the number in the statement. 

 3)     Returns: "Not interesting"  There is only one digit 6 in this number, so it's not interesting. 

 4)     5)     Returns: "Not interesting"  This number contains the digit 1 three times. 


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