백준 자바 1152 문자열(단어의 개수)

https://www.acmicpc.net/problem/1152

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

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

        StringTokenizer st = new StringTokenizer(br.readLine()," ");
        System.out.println(st.countTokens());
    }
}코드를 입력하세요