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

Ex Input:
Sentence: 'a person with a cell phone standing next to a train'. Replace the letter 's' with 't' in the sentence.

Ex Output:
a perton with a cell phone ttanding next to a train


Ex Input:
Sentence: 'an older red airplane is going straight up'. Replace the letter 'h' with 'z' in the sentence.

Ex Output:
an older red airplane is going straigzt up


Ex Input:
Sentence: 'a large flower is sitting in the vase on the shelf'. Replace the letter 'e' with 'd' in the sentence.

Ex Output:

a largd flowdr is sitting in thd vasd on thd shdlf