#include <fstream>
#include <string>

int main(void)
{
    std::ifstream in("text.in");
    std::ofstream out("text.out");
    std::string line;
    unsigned int spaces = 1, length;

    std::getline(in, line);
    length = line.size();

    for(unsigned int i = 0; i < line.size(); i++)
    {
        if(line[i]==' ')
        {
            while(1)
            {
                if(line[i+1]==' ' && i + 1 < line.size() - 1)
                {
                    i++;
                    length--;
                }
                else
                    break;
            }
            spaces++;
            length--;
        }
        else
        if(isalpha(line[i])==0)
            length--;
    }
    out<<length/spaces;
}