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

[Q]: Sentence: 'the man is holding a plastic sled with snow in it next to a child'. Find frequency of the letter 'g'
[A]: 1


[Q]: Sentence: 'a woman is taking a sip of a drink from a glass'. Find frequency of the letter 'i'
[A]: 4


[Q]: Sentence: 'a man in a black wet suit rides an orange surfboard on the water'. Find frequency of the letter 'o'
[A]:
3