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

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 group of people play a video game in a living room'. Replace the letter 'p' with 'u' in the sentence.

Output: a grouu of ueoule ulay a video game in a living room


Input: Consider Input: Sentence: 'several types of animals graze in a field of grass'. Replace the letter 't' with 'a' in the sentence.


Output: several aypes of animals graze in a field of grass