instruction:
In this task, you need to replace a letter in the sentence with another given letter.
question:
Sentence: 'a herd of cattle standing on a lush green field'. Replace the letter 'g' with 'f' in the sentence.
answer:
a herd of cattle standinf on a lush freen field


question:
Sentence: 'a couple of kids are sitting in a field'. Replace the letter 't' with 'v' in the sentence.
answer:
a couple of kids are sivving in a field


question:
Sentence: 'a group of men standing around a display of assorted missles'. Replace the letter 'a' with 'g' in the sentence.
answer:

g group of men stgnding ground g displgy of gssorted missles