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

Example Input: Sentence: 'a woman is snowboarding down a snowy hill'. Replace the letter 'l' with 'b' in the sentence.
Example Output: a woman is snowboarding down a snowy hibb

Example Input: Sentence: 'a man in black shirt laying on bed with a teddy bear'. Replace the letter 'd' with 'b' in the sentence.
Example Output: a man in black shirt laying on beb with a tebby bear

Example Input: Sentence: 'a beautiful young lady standing next to a  man on a tennis court'. Replace the letter 'i' with 'd' in the sentence.
Example Output:
a beautdful young lady standdng next to a  man on a tennds court