TASK DEFINITION: In this task, you need to replace a letter in the sentence with another given letter.
PROBLEM: Sentence: 'a person is looking out of a large window'. Replace the letter 'o' with 'p' in the sentence.

SOLUTION: a perspn is lppking put pf a large windpw

PROBLEM: Sentence: 'there are people camping and flying kites in a field'. Replace the letter 't' with 'j' in the sentence.

SOLUTION: jhere are people camping and flying kijes in a field

PROBLEM: Sentence: 'a van driving down a cracked street'. Replace the letter 'd' with 'y' in the sentence.

SOLUTION:
a van yriving yown a crackey street