instruction:
In this task, you need to count the number of times the given letter appears in the given sentence.
question:
Sentence: 'a line of people on motorcycles on the road'. Find frequency of the letter 'e'
answer:
5


question:
Sentence: 'a crowd of people standing in front of a green train'. Find frequency of the letter 'g'
answer:
2


question:
Sentence: 'young woman playing wii in a furnished living room'. Find frequency of the letter 'h'
answer:

1