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

Example Input: Sentence: 'this is a tennis player getting ready to serve the ball'. Replace the letter 'h' with 'y' in the sentence.
Example Output: tyis is a tennis player getting ready to serve tye ball

Example Input: Sentence: 'a woman is on skis riding down the snow covered sloped'. Replace the letter 'd' with 'q' in the sentence.
Example Output: a woman is on skis riqing qown the snow covereq slopeq

Example Input: Sentence: 'a person walks down the street with an umbrella decorated in the british flag'. Replace the letter 'w' with 'e' in the sentence.
Example Output:
a person ealks doen the street eith an umbrella decorated in the british flag