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

Sentence: 'giraffes behind a fence in the trees'. Replace the letter 'h' with 'l' in the sentence.
giraffes belind a fence in tle trees

Sentence: 'a crowd stands under a set of lights in the ceiling and one person holds up a cell phone'. Replace the letter 'r' with 'f' in the sentence.
a cfowd stands undef a set of lights in the ceiling and one pefson holds up a cell phone

Sentence: 'a chair and umbrella on a sandy beach'. Replace the letter 'n' with 'a' in the sentence.

a chair aad umbrella oa a saady beach