instruction:
In this task, you need to replace a letter in the sentence with another given letter.
question:
Sentence: 'a person that is sitting under an umbrella'. Replace the letter 'a' with 'l' in the sentence.
answer:
l person thlt is sitting under ln umbrelll


question:
Sentence: 'a skier in the midst of a jump'. Replace the letter 'm' with 'd' in the sentence.
answer:
a skier in the didst of a judp


question:
Sentence: 'a row of truck are parked by a boat launch'. Replace the letter 'a' with 'm' in the sentence.
answer:

m row of truck mre pmrked by m bomt lmunch