백준 29766 자바 - DKSH 찾기

// DKSH 찾기
package Bronze_IV_4;

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

public class Ex29766 {
    public static void main(String[] args) throws IOException {
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        String s = br.readLine();
        int length = s.length();
        int wordLength = s.replace("DKSH", "").length();
        System.out.println((length - wordLength) / 4);
    }
}