#include<fstream>
#include<cstring>
using namespace std;
int main()
{
    ifstream cin("text.in");
    ofstream cout("text.out");
    char s[10000];
    int lit=0,cuv=0;
    while(!cin.eof())
    {
        cin.getline(s,10000);
        for(int i=0;i<strlen(s);++i)
        {
            if((s[i]>='a' && s[i]<='z')||(s[i]>='A'&&s[i]<='Z'))
                ++cuv;
            while((s[i]>='a' && s[i]<='z')||(s[i]>='A'&&s[i]<='Z'))
            {
                ++lit;
                ++i;
            }
        }

    }
    cout<<lit/cuv;
}