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

Example Input: Sentence: 'a street pole stating three different street names and numbers'. Replace the letter 'm' with 't' in the sentence.
Example Output: a street pole stating three different street nates and nutbers

Example Input: Sentence: 'a tennis player throwing a ball at the ground'. Replace the letter 'r' with 'f' in the sentence.
Example Output: a tennis playef thfowing a ball at the gfound

Example Input: Sentence: 'many stuffed bears are different sizes and have different costumes'. Replace the letter 'e' with 'y' in the sentence.
Example Output:
many stuffyd byars ary diffyrynt sizys and havy diffyrynt costumys