import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
public class Test346 {

	public static void main(String[] args) {
		int result = 0;
		BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
		try {
			int count_w = 0;
			String str = br.readLine();
			char[] ch = str.toCharArray();
			for(int i=ch.length-1;i>=0;i--){
				if(ch[i]=='w'){
					count_w++;
				}else if(ch[i]=='c'){
					if(count_w >= 2){
						result += count_w * (count_w - 1) / 2 ;
					}
				}
			}
			System.out.println(result);
		} catch (IOException e) {
			e.printStackTrace();
		}
	}
}