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

Example Input: Sentence: 'this is a seafood platter with lobster and corn on the cob'. Replace the letter 't' with 'z' in the sentence.
Example Output: zhis is a seafood plazzer wizh lobszer and corn on zhe cob

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: 'the player with the headband is hitting a tennis racket'. Replace the letter 's' with 'j' in the sentence.
Example Output:
the player with the headband ij hitting a tennij racket