given an array A of N integers, returns the length of the longest consistent fragment of A in which all elements can be generated using at most two different digits. You must use the same digits for all elements.

Examples:

$1.$ Given A $=[23,333,33,30,0,505],$ the function should return $4.$ Elements $333,33,$

$30$ and $0$ can be generated using only digits $0$ and $3.$

$2.$ Given A $=[615,88,498,99,91,$ the function should return $2.$ The last two

elements can be generated using only digit $9.$

$3.$ Given A $=[123,456],$ the function should return $0.$

Assume that:

$$ N is an integer within the range $(1.\mathrm{.}100)$;

$$ each element of array A is an integer within the range

$[$O$.\mathrm{.}1,000,000,000].$

In your solution, focus on correctness.

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