package com.company;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.HashSet;

class Student {
    String name;

    Student(String name) {
        this.name = name;
        StudentGroup.set.add(this.name);
    }
}

class StudentGroup {
    public static HashSet<String> set = new HashSet<>();
}

public class Main {
    public static void main(String[] args) throws IOException {
        BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));

        String input = null;

        while (!(input =reader.readLine()).equals("End")) {
            Student student = new Student(input);
        }

        System.out.println(StudentGroup.set.size());
    }
}