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

Example Input: Sentence: 'a gate with a stop sign blocking the road'. Replace the letter 'h' with 'y' in the sentence.
Example Output: a gate wity a stop sign blocking tye road

Example Input: Sentence: 'two kids sitting on a  child's bed and smiling'. Replace the letter 't' with 's' in the sentence.
Example Output: swo kids sissing on a  child's bed and smiling

Example Input: Sentence: 'a girl sticking her hand in a large bowl'. Replace the letter 'a' with 'g' in the sentence.
Example Output:
g girl sticking her hgnd in g lgrge bowl