#include <iostream>
#include <fstream>
using namespace std;
char c;
int nrcar,nrcuv;
int main()
{
    ifstream f("text.in");
    ofstream g("text.out");
    while(f.get(c))
        if((c>='A' && c<='Z') || (c>='a' && c<='z'))
        {
            nrcar++;
            while(f.get(c) && c!='\n' && (c>='A' && c<='Z') || (c>='a' && c<='z'))
                nrcar++;
            nrcuv++;
        }
    g<<nrcar/nrcuv;
    return 0;
}