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 couch, footrest, tv and other furniture are arranged in a living room'. Replace the letter 'o' with 'g' in the sentence.
answer:
a cguch, fggtrest, tv and gther furniture are arranged in a living rggm

question:
Sentence: 'it's christmas and the cat is not happy about being dressed in a santa hat'. Replace the letter 'r' with 'b' in the sentence.
answer:
it's chbistmas and the cat is not happy about being dbessed in a santa hat