import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;

public class QuestionB {

	public static void main(String[] args) {
		// TODO 自動生成されたメソッド・スタブ
		BufferedReader in = new BufferedReader(new InputStreamReader(System.in));
		String line;

		try{
			line = in.readLine();
		}catch(IOException e){
			System.out.println("0");
			return;
		}

		long result = 0;
		long wcount = 0;

		for(int i = line.length() - 1; i >= 0; i--){
			char k = line.charAt(i);
			if(k == 'c')
				result += wcount * (wcount - 1)/2;
			if(k == 'w')
				wcount++;
		}

		System.out.println(result);
	}

}