Digital mathematics

Level pending

Let a, b and c be the 356th , 357th and 358th digits respectively after decimal places, of the decimal expansion of the fraction ( 98235672325937/99999999999999). Let z be the the biggest perfect square such that z<(100a+10b+c) and y be the smallest perfect square such that y>(100a+10b+c). Let the positive square root of z be k and that of y be l. Find k+l.

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