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

Example Input: Sentence: 'horses drink and graze the field and water'. Replace the letter 'i' with 'c' in the sentence.
Example Output: horses drcnk and graze the fceld and water

Example Input: Sentence: 'a house cat sits on an oven door, sniffing the oven racks inside'. Replace the letter 'i' with 'y' in the sentence.
Example Output: a house cat syts on an oven door, snyffyng the oven racks ynsyde

Example Input: Sentence: 'a women holding a tennis racket jumping in the air'. Replace the letter 'j' with 'r' in the sentence.
Example Output:
a women holding a tennis racket rumping in the air