Homomorphism defined on a simple group

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Can anybody please help me with this question???

Let $G$ and $G'$ be groups with $G$ simple.

Prove that if $|G| > |G'|$, then the only homomorphism $\varphi : G → G'$ is the trivial one.

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Hint: The kernel of any homomorphism $f: G \to G'$ is a normal subgroup of $G$.