instruction:
In this task, you need to replace a letter in the sentence with another given letter.
question:
Sentence: 'a crowd stands under a set of lights in the ceiling and one person holds up a cell phone'. Replace the letter 'r' with 'f' in the sentence.
answer:
a cfowd stands undef a set of lights in the ceiling and one pefson holds up a cell phone


question:
Sentence: 'a couple of giraffes eat some food out of a trey'. Replace the letter 'f' with 'e' in the sentence.
answer:
a couple oe giraeees eat some eood out oe a trey


question:
Sentence: 'two people using a stainless steel blender outside'. Replace the letter 's' with 'o' in the sentence.
answer:

two people uoing a otainleoo oteel blender outoide