Culture shock

Thore is a visiting scholar at a progressive university, where the administrators have decided that gendered pronouns are politically incorrect. The pronouns he, she, him, and her must be replaced with the gender neutral they and them. Thore does not want to appear old-fashioned, but has difficulties adapting. To train themselves to speak properly, he (sorry, they) has programmed a behaviour-improving wristband to analyse their speech and give them an electric shock every time he (buzz) uses one of the forbidden words (he, him, she, or her). Thore is worried that he (buzz) will be electrocuted and needs your help to determine how many electric shocks he (buzz) will receive from different sentences.

The first line contains an integer $1 \leq N \leq 100\,000$, the number of words Thore speaks. This is followed by a single line with $N$ whitespace separated words, each word consisting of up to $20$ lowercase characters a to z.

The number of electrical shocks Thore receives.