#include<iostream>
#include<fstream>
#include<ctype.h>
using namespace std;

int main()
{
    ifstream fin("text.in");
    ofstream fout("text.out");
    int nrcar=0,nrcuv=0;
    char c;

    while(fin.get(c))
    {
        if(isalpha(c))
        nrcar++;
        while(fin.get(c) && c!='\n' && isalpha(c))
            nrcar++;
        nrcuv++;
    }
    fout<<nrcar/nrcuv;;
    fin.close();
    fout.close();

    return 0;
}