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

Ex Input:
Sentence: 'a group of men sitting at a desk with lap top computers'. Replace the letter 'p' with 'z' in the sentence.

Ex Output:
a grouz of men sitting at a desk with laz toz comzuters


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

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


Ex Input:
Sentence: 'a view of a boat with a flag on it, another boat and the land across the body of water'. Replace the letter 'o' with 'p' in the sentence.

Ex Output:

a view pf a bpat with a flag pn it, anpther bpat and the land acrpss the bpdy pf water