instruction:
In this task, you need to count the number of times the given letter appears in the given sentence.
question:
Sentence: 'a man that is on his cell phone'. Find frequency of the letter 's'
answer:
2


question:
Sentence: 'a small boy in a high chair eating a cupcake'. Find frequency of the letter 'i'
answer:
4


question:
Sentence: 'a woman walking on a shore next to a river'. Find frequency of the letter 'v'
answer:

1