instruction:
In this task, you need to count the number of times the given letter appears in the given sentence.
question:
Sentence: 'a large group of motorcycles parked along a street'. Find frequency of the letter 'a'
answer:
5


question:
Sentence: 'a man in a black wet suit rides an orange surfboard on the water'. Find frequency of the letter 'o'
answer:
3


question:
Sentence: 'five adult giraffes are moving through very tall brush'. Find frequency of the letter 'm'
answer:

1