Detailed Instructions: In this task, you need to replace a letter in the sentence with another given letter.
See one example below:
Problem: Sentence: 'group of motorcycle motorists trying to merge into traffic'. Replace the letter 'o' with 'n' in the sentence.
Solution: grnup nf mntnrcycle mntnrists trying tn merge intn traffic
Explanation: The letter 'o' has been replaced in the letter 'n'.

Problem: Sentence: 'a skier with a blue helmet and red pants skis down a snowy path in front of pine trees that are heavy with snow'. Replace the letter 't' with 'a' in the sentence.
Solution:
a skier wiah a blue helmea and red panas skis down a snowy paah in frona of pine arees ahaa are heavy wiah snow