instruction:
In this task, you need to count the number of times the given letter appears in the given sentence.
question:
Sentence: 'a small boy in a high chair eating a cupcake'. Find frequency of the letter 'i'
answer:
4


question:
Sentence: 'a dog on a couch near many pillows'. Find frequency of the letter 'p'
answer:
1


question:
Sentence: 'a computer that has its background as an image of behind the monitor'. Find frequency of the letter 'n'
answer:

4