instruction:
In this task, you need to replace a letter in the sentence with another given letter.
question:
Sentence: 'a giraffe looking over a fence and another reaching over the fence'. Replace the letter 'l' with 'h' in the sentence.
answer:
a giraffe hooking over a fence and another reaching over the fence


question:
Sentence: 'a group of giraffe standing on top of a dirt field'. Replace the letter 'a' with 'y' in the sentence.
answer:
y group of giryffe stynding on top of y dirt field


question:
Sentence: 'small herd of grazing cattle in field of farm land'. Replace the letter 't' with 'g' in the sentence.
answer:

small herd of grazing caggle in field of farm land