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

Example Input: Sentence: 'a fire hydrant with a message painted on it'. Replace the letter 'n' with 'j' in the sentence.
Example Output: a fire hydrajt with a message paijted oj it

Example Input: Sentence: 'a group of people riding on top of snow boarding equipment'. Replace the letter 'e' with 'x' in the sentence.
Example Output: a group of pxoplx riding on top of snow boarding xquipmxnt

Example Input: Sentence: 'three blue utility sinks and two white regular sinks'. Replace the letter 'e' with 'o' in the sentence.
Example Output:
throo bluo utility sinks and two whito rogular sinks