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

Example Input: Sentence: 'the color theme in this kitchen is red and black'. Replace the letter 't' with 'v' in the sentence.
Example Output: vhe color vheme in vhis kivchen is red and black

Example Input: Sentence: 'a fancy clock is lit up on the street'. Replace the letter 'o' with 'f' in the sentence.
Example Output: a fancy clfck is lit up fn the street

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