#include<fstream>
using namespace std;
ifstream  fin("text.in");
ofstream fout("text.out");

int n,cuv,lit,i,k;//nr de cuvinte/nr de litere
char a[2];
unsigned char ch;

int main()
{
    lit=0;cuv=0;k=0;
    while(fin.get(a,2))
    {
        ch=a[0];
        if((ch>='a' && ch<='z') || (ch>='A' && ch<='Z'))
        {
            lit++;
            if(k==0)
            {
                cuv++;
                k=1;
            }
        }
        else
        {
            k=0;
        }
    }
    if(lit==0)fout<<0;
    else fout<<lit/cuv;
    fin.close();
    fout.close();
    return 0;
}