A digit is considered isolated if both its left and right neighbors are different from itself. For example, in the number 776444, the digit 6 is isolated, but the other digits are not. Complete the function that returns if the given input number contains an isolated digit or not.
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Just a note that Test Case 3 has a slight probability that all the digits in the number will be zero, in which case a correct solution (digit 0 is isolated) will fail the assertion (presumes all digits are repeating). This happened to me once while I was testing with the code repeatedly, but fortunately did not happen when I went to submit.