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

Example Input: Sentence: 'red helicopter with landing wheels flying in the sky'. Replace the letter 'h' with 'y' in the sentence.
Example Output: red yelicopter wity landing wyeels flying in tye sky

Example Input: Sentence: 'three laptops are turned on lined up on a table'. Replace the letter 't' with 'g' in the sentence.
Example Output: ghree lapgops are gurned on lined up on a gable

Example Input: Sentence: 'a tennis player bounces the ball for luck before serving'. Replace the letter 'c' with 'j' in the sentence.
Example Output:
a tennis player bounjes the ball for lujk before serving