In this task, you need to count the number of times the given letter appears in the given sentence.

[Q]: Sentence: 'a railroad train pulling up to the train platform'. Find frequency of the letter 'o'
[A]: 3


[Q]: Sentence: 'man in a radio studio wearing a suit in front of a microphone'. Find frequency of the letter 't'
[A]: 3


[Q]: Sentence: 'there is a man wearing a hat and riding a skateboard'. Find frequency of the letter 'w'
[A]:
1