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

[Q]: Sentence: 'a man with a large grey and black beard and glasses and a tie'. Find frequency of the letter 'e'
[A]: 5


[Q]: Sentence: 'two people holding their skies in a snowy resort'. Find frequency of the letter 'n'
[A]: 3


[Q]: Sentence: 'two women standing next to each other holding tennis rackets'. Find frequency of the letter 't'
[A]:
7