#include<iostream>
#include<fstream>

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((c>='A' && c<='Z') || (c>='a' && c<='z'))
            nrcar++;
        while(fin.get(c) && c!='\n' && (c>='A' && c<='Z') || (c>='a' && c<='z'))
            nrcar++;
        nrcuv++;
    }
    fout<<nrcar/nrcuv;;
    fin.close();
    fout.close();

    return 0;
}