1

import java.io.*;
import java.util.*;

class Main {
    public static final void main(final String[] args) throws IOException {
        System.out.println(
                Arrays.stream(new BufferedReader(new FileReader("src/k7a-3.txt"))
                        .readLine()
                        .split("C|D"))
                        .max(Comparator.comparing(String::length))
                        .get()
                        .length()
        );
    }
}