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

Sentence: 'a table full of various types of cellphones, pdas and pagers'. Replace the letter 's' with 'f' in the sentence.
a table full of variouf typef of cellphonef, pdaf and pagerf

Sentence: 'a horse in a country field with woods in the background'. Replace the letter 'a' with 'i' in the sentence.
i horse in i country field with woods in the bickground

Sentence: 'there is a skateboarder jumping on his board'. Replace the letter 'a' with 'j' in the sentence.

there is j skjtebojrder jumping on his bojrd