package main

import (
    "bufio"
    "os"
//  "strings"
    "fmt"
)

func main() {
    m := make(map[string]int, 1)
    for i := 0; i < 4; i++ {
        reader := bufio.NewReader(os.Stdin)
        text, _ := reader.ReadString('\r')
        // fmt.Println(text)
        // text = strings.TrimSuffix(text, "\n")
        text_c := []rune(text)
        if len(text_c) == 0 {
            continue
        } else if text_c[0] == '\r' || text_c[0] == '\n' {
            continue
        }
        // fmt.Println(text_c)
        tmp_j := 0
        for j, n := range text_c {
            if n == ' ' || n == '\r' || n == '\n' {
                tmp := text_c[tmp_j:j]
                // fmt.Println(string(tmp))
                if string(tmp) == "" {
                    continue
                }
                m[string(tmp)] ++
                // text_c = text_c[j+1:]
                tmp_j = j + 1
            }
        }
    }
    fmt.Println(len(m))
    // fmt.Println(m)
}