#include <fstream>
#include <cstring>
using namespace std;
ifstream cin("text.in");
ofstream cout("text.out");
int main()
{
    char s[1000000],aux[256];
    int k=0, k1=0;
    while(cin.getline(s,256))
    {
        for(int i=0; s[i]!=0; i++)
        {

            if(s[i]>='a'&&s[i]<='z'||s[i]>='A'&&s[i]<='Z'){

            while(s[i]>='a'&&s[i]<='z'||s[i]>='A'&&s[i]<='Z')
            {
                k++;i++;
            }


                k1++;
            }
        }

    }
    cout<<k/k1;

    return 0;
}