문제 출처: https://www.acmicpc.net/problem/1152
문제
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 reader = new BufferedReader(new InputStreamReader(System.in));
System.out.println(new StringTokenizer(reader.readLine()).countTokens());
reader.close();
}
}