import java.util.Arrays;
import java.util.HashSet;
import java.util.LinkedList;
import java.util.Scanner;
import java.util.Set;

public class Main {

	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		
		char[] inputs = sc.next().toCharArray();
		
		long w_count = 0;
		for(int i = inputs.length - 1; i >= 0; i--){
			if(inputs[i] == 'w'){ w_count++; }
		}
		
		long answer = 0;
		for(int fst = 0; fst < inputs.length; fst++){
			if(inputs[fst] == 'w'){ w_count--; }
			
			if(inputs[fst] != 'c'){ continue; }
			answer += (w_count * (w_count - 1)) / 2;
		}
		
		System.out.println(answer);
	}

}