import java.util.*;

public class Main {
  public static void main(String[] args) {
    Scanner sc = new Scanner(System.in);
    String s = sc.next();
    int n = s.length();
    long[] wk = new long[n];
    for(int i = 0; i < n; i++) {
      if(s.charAt(i) == 'w') {
        if(i == 0) {
          wk[i] = 1;
        } else {
          wk[i] = wk[i - 1] + 1;
        }
      } else {
        wk[i] = wk[i - 1];
      }
    }
    long ans = 0;
    for(int i = 0; i < n; i++) {
      if(s.charAt(i) == 'c') {
        long t = wk[n - 1] - wk[i];
        ans += ((t * (t - 1)) / 2);
      }
    }
    System.out.println(ans);
  }
}