package main

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

func main() {
    scanner := bufio.NewScanner(os.Stdin)
    scanner.Scan()
    str := scanner.Text()
    
    worlds := strings.Fields(str)

    fmt.Println(len(worlds[len(worlds)-1]))
}

* 熟悉输入

* strings.Fields 按空格分隔