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

Example Input: Sentence: 'a man is at bat at a baseball game with a crowd watching'. Replace the letter 't' with 'f' in the sentence.
Example Output: a man is af baf af a baseball game wifh a crowd wafching

Example Input: Sentence: 'a black and white image of a vehicle that is decorated like a dog'. Replace the letter 'a' with 'p' in the sentence.
Example Output: p blpck pnd white impge of p vehicle thpt is decorpted like p dog

Example Input: Sentence: 'a clock is sitting atop a church tower'. Replace the letter 't' with 's' in the sentence.
Example Output:
a clock is sissing asop a church sower