TASK DEFINITION: In this task, you need to replace a letter in the sentence with another given letter.
PROBLEM: Sentence: 'a toilet that is being worked on with its  seat removed'. Replace the letter 't' with 'p' in the sentence.

SOLUTION: a poilep phap is being worked on wiph ips  seap removed

PROBLEM: Sentence: 'a fire hydrant and a rolled up fire hose'. Replace the letter 'd' with 's' in the sentence.

SOLUTION: a fire hysrant ans a rolles up fire hose

PROBLEM: Sentence: 'a small group of zebra and giraffe in an enclosure'. Replace the letter 'a' with 'k' in the sentence.

SOLUTION:
k smkll group of zebrk knd girkffe in kn enclosure