#include<fstream>
using namespace std;
ifstream fin("text.in");
ofstream fout("text.out");
int main()
{
    int cuvinte=0,litere=0,potsanumarcuvinte=0;
    char caracter;
    while(fin>>caracter)
    {
        if((caracter>='a'&&caracter<='z')||(caracter>='A'&&caracter<='Z'))
        {
            litere++;
            if(potsanumarcuvinte==0)
            {
                cuvinte++;
                potsanumarcuvinte=1;
            }
        }
        else
            potsanumarcuvinte=0;
    }
    fout<<litere/cuvinte;
    return 0;
}