import java.io.*;
import java.lang.reflect.Array;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collections;
import java.util.List;
import java.util.Scanner;
 
public class Main {
    public static void main (String[] args) throws IOException
    {
    	Scanner sc = new Scanner(System.in);
    	String s = sc.nextLine();
    	int cs = 0 ;
    	
    	
    	for (int i = 2 ; (s.substring(i-1,i)).equals("c"); i++){
    		cs = i;
    	}
    	
    	int n = s.length();
    	
    	int ans = Math.min(cs-1,n-cs);
    	System.out.println(ans);
    	
    	
    }    	
}