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

[EX Q]: Sentence: 'a crowd watches as giraffes graze the tree tops at the zoo'. Replace the letter 't' with 'q' in the sentence.
[EX A]: a crowd waqches as giraffes graze qhe qree qops aq qhe zoo

[EX Q]: Sentence: 'a man standing next to a parking meter'. Replace the letter 'n' with 'p' in the sentence.
[EX A]: a map stapdipg pext to a parkipg meter

[EX Q]: Sentence: 'a red double decker london bus on the street'. Replace the letter 'd' with 'f' in the sentence.
[EX A]:
a ref fouble fecker lonfon bus on the street