instruction:
In this task, you need to count the number of times the given letter appears in the given sentence.
question:
Sentence: 'a table topped with a cupcake on a picture of a cupcake'. Find frequency of the letter 'o'
answer:
3


question:
Sentence: 'some cubbies with towels in a blue bathroom'. Find frequency of the letter 'l'
answer:
2


question:
Sentence: 'a surfer on a surf board riding a wave'. Find frequency of the letter 'a'
answer:

5