instruction:
In this task, you need to replace a letter in the sentence with another given letter.
question:
Sentence: 'a table full of various types of cellphones, pdas and pagers'. Replace the letter 's' with 'f' in the sentence.
answer:
a table full of variouf typef of cellphonef, pdaf and pagerf


question:
Sentence: 'a giraffe standing alone with a low fence behind it'. Replace the letter 't' with 'o' in the sentence.
answer:
a giraffe soanding alone wioh a low fence behind io


question:
Sentence: 'food on a plate with sauce, mash potatoes and gravy and a beer'. Replace the letter 'd' with 'i' in the sentence.
answer:

fooi on a plate with sauce, mash potatoes ani gravy ani a beer