Context-Free grammar - Normal form

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Termials = a,b,c.
non-Termials = A,S.
Production Rules:
(1) S → aS
(2) S → bA
(3) A → bA
(4) A → cA
(5) A → c
(6) S → a
How do you write the following in normal form, I understand that it is currently not a context free grammar language of normal form , so I want to modify to be.