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

[Q]: Sentence: 'a plane with stairs next to it sitting in a large lot'. Find frequency of the letter 'i'
[A]: 6


[Q]: Sentence: 'a bus with two floors belonging to london country'. Find frequency of the letter 't'
[A]: 4


[Q]: Sentence: 'men eating many burgers and sodas on picnic tables'. Find frequency of the letter 'p'
[A]:
1