instruction:
In this task, you need to count the number of times the given letter appears in the given sentence.
question:
Sentence: 'two people and two children walking in a building'. Find frequency of the letter 'd'
answer:
3


question:
Sentence: 'a mixed bouquet of flowers in a glass vase set before a window'. Find frequency of the letter 'w'
answer:
3


question:
Sentence: 'a woman in an ethnic hat browses through robes'. Find frequency of the letter 'n'
answer:

4