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

[Q]: Sentence: 'a doll with huge eyes and black hair with blunt bangs holds a red umbrella'. Find frequency of the letter 'e'
[A]: 5


[Q]: Sentence: 'a pizza is in a box on a table outside'. Find frequency of the letter 'u'
[A]: 1


[Q]: Sentence: 'a boy controlling his video game system with a remote control'. Find frequency of the letter 'l'
[A]:
3