TASK DEFINITION: In this task, you need to replace a letter in the sentence with another given letter.
PROBLEM: Sentence: 'a group of small children sitting at a table in front of a pizza'. Replace the letter 'r' with 'd' in the sentence.

SOLUTION: a gdoup of small childden sitting at a table in fdont of a pizza

PROBLEM: Sentence: 'a waterview with multiple boats in the water'. Replace the letter 'r' with 'w' in the sentence.

SOLUTION: a watewview with multiple boats in the watew

PROBLEM: Sentence: 'a memorial with various plaques and american flags on it'. Replace the letter 'a' with 'k' in the sentence.

SOLUTION:
k memorikl with vkrious plkques knd kmerickn flkgs on it