instruction:
In this task, you need to count the number of times the given letter appears in the given sentence.
question:
Sentence: 'a train on a train track going through a bunch of trees'. Find frequency of the letter 'u'
answer:
2


question:
Sentence: 'flower in a vase full of water sitting on a stand '. Find frequency of the letter 'l'
answer:
3


question:
Sentence: 'a man wearing glasses pouring something into a cup being held by a blonde   woman'. Find frequency of the letter 'e'
answer:

6