让我们有请，unordered_map ！！！

#include<bits/stdc++.h>
using namespace std;
int read();
int n,ans;
string st;
unordered_map <string,bool> vis;
int main()
{
	n=read();
	while(n--)
	{
		cin>>st;
		if(!vis[st]) ans++,vis[st]=1;
	}
	cout<<ans;
	return 0;
}
int read()
{
	int x=0,f=1; char ch=getchar();
	while(ch<'0' || ch>'9')
	{
		if(ch=='-') f=-1;
		ch=getchar();
	}
	while(ch>='0' && ch<='9')
	{
		x=(x<<1)+(x<<3)+(ch^48);
		ch=getchar();
	}
	return x*f;
}