#include <iostream>
#include <fstream>
#include <string>

using namespace std;

int main()
{
    ifstream f("text.in");
    ofstream g("text.out");
    char a; int cont=1, k=0, k2=0;
    while(!('a'<=a&&a<='z')&&!('A'<=a&&a<='Z'))
        f.get(a);
    while(f.get(a))
    {
        if(('a'<=a&&a<='z')||('A'<=a&&a<='Z'))
        {
            cont++; k++;
        }
        else
            if(k!=0)
            {
                k2++;
                k=0;
            }
    }
    g<<cont/k2;
    return 0;
}