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

Sentence: 'this is a tennis player getting ready to serve the ball'. Replace the letter 'h' with 'y' in the sentence.
tyis is a tennis player getting ready to serve tye ball

Sentence: 'people wait for a train on a snowy sidewalk'. Replace the letter 'n' with 'm' in the sentence.
people wait for a traim om a smowy sidewalk

Sentence: 'a cat is sitting next to a camera in a case'. Replace the letter 'e' with 'z' in the sentence.

a cat is sitting nzxt to a camzra in a casz