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

Example Input: Sentence: 'a group of young people playing a game of soccer'. Replace the letter 'c' with 'o' in the sentence.
Example Output: a group of young people playing a game of soooer

Example Input: Sentence: 'a dog wearing a hat on top of it's head'. Replace the letter 'g' with 'o' in the sentence.
Example Output: a doo wearino a hat on top of it's head

Example Input: Sentence: 'a boy laying on a medical bed inside a tent'. Replace the letter 'c' with 'd' in the sentence.
Example Output:
a boy laying on a medidal bed inside a tent