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

Q: Sentence: 'a table full of various types of cellphones, pdas and pagers'. Replace the letter 's' with 'f' in the sentence.

A: a table full of variouf typef of cellphonef, pdaf and pagerf
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Q: Sentence: 'busy city street with pedestrians and cars with lights all around'. Replace the letter 'r' with 'k' in the sentence.

A: busy city stkeet with pedestkians and caks with lights all akound
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Q: Sentence: 'a young animal is hopping over a larger one on some rocks'. Replace the letter 'a' with 'f' in the sentence.

A:
f young fnimfl is hopping over f lfrger one on some rocks
****