instruction:
In this task, you need to replace a letter in the sentence with another given letter.
question:
Sentence: 'a mouse and keyboard sitting on a wooden desk'. Replace the letter 'a' with 'n' in the sentence.
answer:
n mouse nnd keybonrd sitting on n wooden desk


question:
Sentence: 'small kit bathroom sink with purple walls and lights on it'. Replace the letter 'o' with 'r' in the sentence.
answer:
small kit bathrrrm sink with purple walls and lights rn it


question:
Sentence: 'a sandwich with various toppings next to a sweet potato'. Replace the letter 't' with 'b' in the sentence.
answer:

a sandwich wibh various boppings nexb bo a sweeb pobabo