import java.util.*;

public class Exercise30{
  public static void main (String[] args){

    Scanner sc = new Scanner(System.in);

    String str = sc.next();
    char[] charArray = str.toCharArray();

    int count = 0;
    int w = 0;

    for (int a = charArray.length - 1; a >= 0; a--){
      if (charArray[a] == 'w'){
        w++;
      }

      if (charArray[a] == 'c'){
        count += w * (w - 1) / 2;
      }
    }

    System.out.println(count);
  }
}