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: 'two tennis players shaking hands over the net'. Replace the letter 'n' with 'f' in the sentence.
Example Output: two teffis players shakifg hafds over the fet

Example Input: Sentence: 'the two boats are docked at the rocky shore'. Replace the letter 't' with 'n' in the sentence.
Example Output:
nhe nwo boans are docked an nhe rocky shore