In this task, you need to count the occurrences of the given word in the given sentence.

Ex Input:
Sentence: 'in the first picture there are stuffed sea animals in the second there are stuffed monkeys in the third there are stuffed tigers and elephants and in the fourth there are stuffed dogs'. Count the occurrences of the word 'in' in the given sentence.

Ex Output:
4


Ex Input:
Sentence: 'a couple of skis sticking out of a snow covered ground'. Count the occurrences of the word 'of' in the given sentence.

Ex Output:
2


Ex Input:
Sentence: 'a large cow standing in a grass field'. Count the occurrences of the word 'grass' in the given sentence.

Ex Output:

1