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

[Q]: Sentence: 'a memorial with various plaques and american flags on it'. Replace the letter 'a' with 'k' in the sentence.
[A]: k memorikl with vkrious plkques knd kmerickn flkgs on it

[Q]: Sentence: 'a chinese entree displayed on a red plate'. Replace the letter 'n' with 'z' in the sentence.
[A]: a chizese eztree displayed oz a red plate

[Q]: Sentence: 'four men riding horses going down the street in front of a crowd'. Replace the letter 'd' with 't' in the sentence.
[A]:
four men riting horses going town the street in front of a crowt