TASK DEFINITION: In this task, you need to replace a letter in the sentence with another given letter.
PROBLEM: Sentence: 'a table full of various types of cellphones, pdas and pagers'. Replace the letter 's' with 'f' in the sentence.

SOLUTION: a table full of variouf typef of cellphonef, pdaf and pagerf

PROBLEM: Sentence: 'a person snow skiing down a hill while the hold their ski poles'. Replace the letter 'r' with 'g' in the sentence.

SOLUTION: a pegson snow skiing down a hill while the hold theig ski poles

PROBLEM: Sentence: 'a bed with white comforter and two black stiletto heels'. Replace the letter 'h' with 's' in the sentence.

SOLUTION:
a bed wits wsite comforter and two black stiletto seels