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

Example Input: Sentence: 'the kitchen counter has a pitcher of lime juice'. Replace the letter 'h' with 'p' in the sentence.
Example Output: tpe kitcpen counter pas a pitcper of lime juice

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

Example Input: Sentence: 'a bear walking in its enclosure, with a ladder behind it'. Replace the letter 'h' with 'q' in the sentence.
Example Output:
a bear walking in its enclosure, witq a ladder beqind it