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: 'the people are in the library working and studying'. Replace the letter 'r' with 'g' in the sentence.
the people age in the libgagy wogking and studying

Sentence: 'three people play a game of tennis on a tennis court'. Replace the letter 'r' with 'g' in the sentence.

thgee people play a game of tennis on a tennis cougt