What is the oxidation number of sulfur (s) in NaHSO3?

I know that Na is 1 but I do not know what else to do. Please explain, thank you for your help!!

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1. NaHSO3.
Na is +1.
H is +1.
O is -2 so 3*-2 = -6
Therefore, S must be +4?

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2. Thank you. I understand how you got the numbers for Na and H and the -6 for O but why does S have to be +4?

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3. 'cause the sum of every atoms's N.O of this molecule is equal to 0

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4. The correct answer is +2

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