#include <fstream>
#include <string>
using namespace std;
ifstream cin("text.in");
ofstream cout("text.out");
int main()
{
    int i,nrl=0,nrc=0;
    string s;
    while(getline(cin,s))
    {
        s.push_back('.');
        for(i=0; i<s.size(); i++)
        {
            if((s[i]>='A' && s[i]<='Z') || (s[i]>='a' && s[i]<='z'))
            {
                nrl++;

            }
            else
            {
                if(i!=0 && ((s[i-1]>='A' && s[i-1]<='Z') || (s[i-1]>='a' && s[i-1]<='z')))
                    nrc++;
            }

        }
    }
    cout<<nrl/nrc;
    return 0;
}