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

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

Ex Output:
a woman holding a tennis lacket getting leady to hit a tennis ball

Ex Input:
Sentence: 'a little girl laying on a boogie board next to the ocean'. Replace the letter 't' with 'm' in the sentence.

Ex Output:
a limmle girl laying on a boogie board nexm mo mhe ocean

Ex Input:
Sentence: 'a group of men standing under a cloudy blue sky with a kite'. Replace the letter 'u' with 'g' in the sentence.

Ex Output:
a grogp of men standing gnder a clogdy blge sky with a kite