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

Input: Consider Input: Sentence: 'a baseball player swings his bat at a pitch'. Replace the letter 's' with 'l' in the sentence.

Output: a baleball player lwingl hil bat at a pitch


Input: Consider Input: Sentence: 'a train traveling through a dark tunnel next to green brush.'. Replace the letter 'r' with 'e' in the sentence.

Output: a teain teaveling theough a daek tunnel next to geeen beush.


Input: Consider Input: Sentence: 'a blue and white train is coming down some tracks'. Replace the letter 'b' with 'u' in the sentence.


Output: a ulue and white train is coming down some tracks