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

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

Sentence: 'a large orange cat sits in a chair outside'. Replace the letter 'e' with 'x' in the sentence.
a largx orangx cat sits in a chair outsidx

Sentence: 'a large elephant that has people all around it'. Replace the letter 'h' with 'm' in the sentence.

a large elepmant tmat mas people all around it