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

[Q]: Sentence: 'a person with a cell phone standing next to a train'. Replace the letter 's' with 't' in the sentence.
[A]: a perton with a cell phone ttanding next to a train


[Q]: Sentence: 'a boy riding his skate board on an obstacle course'. Replace the letter 'e' with 'b' in the sentence.
[A]: a boy riding his skatb board on an obstaclb coursb


[Q]: Sentence: 'a number of people carrying luggage bags'. Replace the letter 'n' with 'r' in the sentence.
[A]:
a rumber of people carryirg luggage bags