import java.util.*;

public class Exercise161 {
  public static void main(String[] args){
    Scanner sc = new Scanner(System.in);
    String str = sc.next();

    int cCount = str.lastIndexOf('c');
    int total = str.length();
    int wCount = total - (cCount + 1);

    System.out.println(Math.min(cCount, wCount));
  }
}