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

Example Input: Sentence: 'a woman holding a tennis racket getting ready to hit a tennis ball'. Replace the letter 'r' with 'l' in the sentence.
Example Output: a woman holding a tennis lacket getting leady to hit a tennis ball

Example Input: Sentence: 'a book shelf full of books and nick nacks '. Replace the letter 'o' with 'm' in the sentence.
Example Output: a bmmk shelf full mf bmmks and nick nacks 

Example Input: Sentence: 'a plate laying on curtains with the image of a cat and her baby'. Replace the letter 'h' with 's' in the sentence.
Example Output:
a plate laying on curtains wits tse image of a cat and ser baby