TASK DEFINITION: In this task, you need to replace a letter in the sentence with another given letter.
PROBLEM: Sentence: 'a woman is standing on a street curb'. Replace the letter 'a' with 't' in the sentence.

SOLUTION: t womtn is sttnding on t street curb

PROBLEM: Sentence: 'a red stop signed has been altered to say stop hate'. Replace the letter 'e' with 't' in the sentence.

SOLUTION: a rtd stop signtd has bttn alttrtd to say stop hatt

PROBLEM: Sentence: 'several  government jets are flying in formation'. Replace the letter 'n' with 'q' in the sentence.

SOLUTION:
several  goverqmeqt jets are flyiqg iq formatioq