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

Example Input: Sentence: 'a couple of giraffes eat some food out of a trey'. Replace the letter 'f' with 'e' in the sentence.
Example Output: a couple oe giraeees eat some eood out oe a trey

Example Input: Sentence: 'two tennis players shaking hands across the net'. Replace the letter 't' with 's' in the sentence.
Example Output: swo sennis players shaking hands across she nes

Example Input: Sentence: 'a computer keyboard and screen monitor on a desk'. Replace the letter 'k' with 'y' in the sentence.
Example Output:
a computer yeyboard and screen monitor on a desy