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

[Q]: Sentence: 'hotel towels with sunglasses perched and hotel business cards and catalog'. Find frequency of the letter 'o'
[A]: 4

[Q]: Sentence: 'two boys are doing skateboard jumps in the street'. Find frequency of the letter 's'
[A]: 4

[Q]: Sentence: 'a snowboarder making a jump of a snowy ledge'. Find frequency of the letter 'o'
[A]:
4