How do I correct this sentence Look cried Louis its a rainbow?

The corrected sentence is: "Look!" cried Louis. "It's a rainbow!"

Here's the breakdown of the corrections:

* "Look" should be capitalized because it starts a sentence.

* Add an exclamation point after "Look" to convey the excitement of Louis's exclamation.

* Add a period after "Louis" to separate the two parts of the sentence.

* Capitalize "It's" because it's a contraction of "It is."

* Add a period at the end of the sentence.