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

Sentence: 'a tennis racket is sitting in the middle of a tennis field'. Replace the letter 'i' with 'f' in the sentence.
a tennfs racket fs sfttfng fn the mfddle of a tennfs ffeld

Sentence: 'a ski slope consisting of several people wearing skis and snowboards'. Replace the letter 'e' with 's' in the sentence.
a ski slops consisting of ssvsral psopls wsaring skis and snowboards

Sentence: 'a lot of items are sorted on the floor ready for packing'. Replace the letter 'n' with 'm' in the sentence.

a lot of items are sorted om the floor ready for packimg