#include <iostream>

int main()
{
    char s[100001];
    char cww[100000] = {0};
    std::cin >> s;
    
    int index = 0;
    int w = 0;
    for(int i = 0; s[i]; i++)
    {
        if((s[i] == 'c') || (s[i] == 'w'))
        {
            cww[index] = s[i];
            index++;
        }
        
        if(s[i] == 'w')
            w++;
    }
    
    
    int ret = 0;
    for(int i = 0; cww[i]; i++)
    {
        if(cww[i] == 'w')
            w--;
        
        if(cww[i] == 'c')
            ret += (w * (w + 1)) / 2;
    }

    std::cout << ret << std::endl;
    
    return 0;
}