instruction:
In this task, you need to replace a letter in the sentence with another given letter.
question:
Sentence: 'a person under an open umbrella in the sand'. Replace the letter 'd' with 'h' in the sentence.
answer:
a person unher an open umbrella in the sanh


question:
Sentence: 'a couple of giraffe standing next to each other near  a fence'. Replace the letter 'f' with 'j' in the sentence.
answer:
a couple oj girajje standing next to each other near  a jence


question:
Sentence: 'there is a stop sign at an intersection between casper and riverton'. Replace the letter 's' with 'a' in the sentence.
answer:

Show your work and conclude with the exact phrasing "Therefore, the final answer is [answer]." where [answer] is just the final number or expression that solves the problem.
user
there ia a atop aign at an interaection between caaper and riverton


