In this task, you need to replace a letter in the sentence with another given letter.

[Q]: Sentence: 'three colorful knit bear toys with button eyes'. Replace the letter 'r' with 'z' in the sentence.
[A]: thzee colozful knit beaz toys with button eyes

[Q]: Sentence: 'a woman is standing on a street curb'. Replace the letter 'a' with 't' in the sentence.
[A]: t womtn is sttnding on t street curb

[Q]: Sentence: 'an elephant standing outside a market on a street'. Replace the letter 'i' with 'y' in the sentence.
[A]:
an elephant standyng outsyde a market on a street