TASK DEFINITION: In this task, you need to replace a letter in the sentence with another given letter.
PROBLEM: Sentence: 'a city street with cars and busses near buildings'. Replace the letter 'e' with 'd' in the sentence.

SOLUTION: a city strddt with cars and bussds ndar buildings

PROBLEM: Sentence: 'two giraffe standing in an enclosure at the zoo next to a  tree'. Replace the letter 'n' with 'g' in the sentence.

SOLUTION: two giraffe stagdigg ig ag egclosure at the zoo gext to a  tree

PROBLEM: Sentence: 'a man is flying a kite in a field'. Replace the letter 'n' with 'f' in the sentence.

SOLUTION:
a maf is flyifg a kite if a field