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

[EX Q]: Sentence: 'a train traveling through a dark tunnel next to green brush.'. Replace the letter 'r' with 'e' in the sentence.
[EX A]: a teain teaveling theough a daek tunnel next to geeen beush.

[EX Q]: Sentence: 'a man extends his arm with a frisbee in hand as another reaches to grab it while teammates watch'. Replace the letter 'a' with 'g' in the sentence.
[EX A]: g mgn extends his grm with g frisbee in hgnd gs gnother regches to grgb it while tegmmgtes wgtch

[EX Q]: Sentence: 'a statue of a cowboy on a horse in the middle of building'. Replace the letter 'e' with 'h' in the sentence.
[EX A]:
a statuh of a cowboy on a horsh in thh middlh of building