TASK DEFINITION: In this task, you need to replace a letter in the sentence with another given letter.
PROBLEM: Sentence: 'a woman gives a thumbs up sign while sitting in front of a sandwich'. Replace the letter 's' with 'h' in the sentence.

SOLUTION: a woman giveh a thumbh up hign while hitting in front of a handwich

PROBLEM: Sentence: 'a woman is on skis riding down the snow covered sloped'. Replace the letter 'd' with 'q' in the sentence.

SOLUTION: a woman is on skis riqing qown the snow covereq slopeq

PROBLEM: Sentence: 'a large herd of elephants standing in the water'. Replace the letter 't' with 'j' in the sentence.

SOLUTION:
a large herd of elephanjs sjanding in jhe wajer