instruction:
In this task, you need to count the number of times the given letter appears in the given sentence.
question:
Sentence: 'a man standing on a tennis court holding a racquet'. Find frequency of the letter 's'
answer:
2

question:
Sentence: 'two women standing next to each other holding tennis rackets'. Find frequency of the letter 't'
answer:
7

question:
Sentence: 'a person wearing blue catching a ball and a person with a red helmet on the ground'. Find frequency of the letter 'd'
answer:
3