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 person on a sidewalk jumping with an umbrella'. Find frequency of the letter 'a'
answer:
5


question:
Sentence: 'two men and a boy are in a room and one man's nose is bandaged while the other is wearing a hat and glasses'. Find frequency of the letter 'e'
answer:

10