instruction:
In this task, you need to replace a letter in the sentence with another given letter.
question:
Sentence: 'a double decker bus stopped outside a station on a street'. Replace the letter 'c' with 'y' in the sentence.
answer:
a double deyker bus stopped outside a station on a street


question:
Sentence: 'giraffes behind a fence in the trees'. Replace the letter 'h' with 'l' in the sentence.
answer:
giraffes belind a fence in tle trees


question:
Sentence: 'giraffe posing for a mug shot in front of trees'. Replace the letter 'r' with 'n' in the sentence.
answer:

ginaffe posing fon a mug shot in fnont of tnees