Count Occurrences of a Word

You are given a series of sentences and a target word. Your task is to count the total occurrences of the target word in all the sentences, regardless of letter case. For example, if a sentence contains World in any mix of uppercase or lowercase letters (e.g. world, WORLD, etc.), it should be counted as an occurrence.

Input is provided via standard input (stdin) and output should be printed to standard output (stdout).

Note: Word matching is case-insensitive and words are separated by whitespace.

Example:
Input:
1 Hello world world
Output:
1

inputFormat

The first line contains an integer n representing the number of sentences. The next n lines each contain a sentence. The last line contains the target word to search for.

Input Format:
n
sentence_1
sentence_2
...
sentence_n
target_word

outputFormat

Output a single integer which is the total number of occurrences of the target word in the given sentences. The matching should be done case-insensitively.

1
Hello world
world

1