#include<bits/stdc++.h>
#define PRIME 98765431
using namespace std;

int n;
string s;
unsigned long long e[PRIME];
int ans;

void add(unsigned long long a)
{
	unsigned long long x=a%PRIME;
	while(e[x])
	{
		x++;
		if(x>=PRIME)
			x=0;
	}
	if(x==a%PRIME)
		ans++;
	e[x]=a;
}

unsigned long long BKDRhash(const char *str)
{
	unsigned int seed=13;
	unsigned long long key=0;
	while(*str)
		key=key*seed+(*str++);
	return key & 0x7fffffff;
}

int main()
{
	ios::sync_with_stdio(false);
	cin>>n;
	for(int i=1;i<=n;i++)
	{
		cin>>s;
		add(BKDRhash(s.c_str()));
	}
	cout<<ans;
	return 0;
}