#include <fstream>
#include <string.h>
using namespace std;
ifstream in ("text.in");
ofstream out ("text.out");
string text;long long lungime,nr_cuvinte,aux;
int main()
{
    getline(in,text);
    for (int i=0;i<text.length();i++)
    {
        if ((text[i]>=65&&text[i]<=90)||(text[i]>=97&&text[i]<=122))
            break;
        else aux++;
    }
    for (int i=aux;i<text.length();i++)
    {
        if (i>0)
        if (((text[i-1]>=65&&text[i-1]<=90)||(text[i-1]>=97&&text[i-1]<=122))&&(text[i]==' '||text[i]=='.'||text[i]=='!'||text[i]=='-'||text[i]==','||text[i]=='?'))
        nr_cuvinte++;
    }
    for (int i=0;i<text.length();i++)
    {
        if ((text[i]>=65&&text[i]<=90)||(text[i]>=97&&text[i]<=122))

        lungime++;
    }
    out<<lungime/nr_cuvinte;
    return 0;
}