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

Example Input: Sentence: 'the view from inside the water looking landward at the beach'. Replace the letter 'a' with 's' in the sentence.
Example Output: the view from inside the wster looking lsndwsrd st the besch

Example Input: Sentence: 'a giraffe and a zebra stare at each other'. Replace the letter 'g' with 'l' in the sentence.
Example Output: a liraffe and a zebra stare at each other

Example Input: Sentence: 'a tennis player runs towards the ball during a match'. Replace the letter 'a' with 'm' in the sentence.
Example Output:
m tennis plmyer runs towmrds the bmll during m mmtch