instruction:
In this task, you need to replace a letter in the sentence with another given letter.
question:
Sentence: 'a close shot of a stop sign near a building'. Replace the letter 'b' with 'u' in the sentence.
answer:
a close shot of a stop sign near a uuilding


question:
Sentence: 'a toilet that is being worked on with its  seat removed'. Replace the letter 't' with 'p' in the sentence.
answer:
a poilep phap is being worked on wiph ips  seap removed


question:
Sentence: 'a white polar bear standing on the edge of a lake'. Replace the letter 'l' with 'u' in the sentence.
answer:

a white pouar bear standing on the edge of a uake