instruction:
In this task, you need to count the number of times the given letter appears in the given sentence.
question:
Sentence: 'a family out snow skiing on a blustery day'. Find frequency of the letter 'i'
answer:
3


question:
Sentence: 'a woman throwing a frisbee on a field'. Find frequency of the letter 's'
answer:
1


question:
Sentence: 'a bathroom with two sinks, a bathtub and a shower'. Find frequency of the letter 't'
answer:

5