#include<iostream>
#include<fstream>
#include<string.h>

using namespace std;

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

    while(!fin.eof())
    {
        fin>>s;
        for(int i=0;i<s.size();i++)
        {
            if(isalpha(s[i]))
                nrcar++;
            if(!isalpha(s[i+1]) && isalpha(s[i]))
                nrcuv++;
        }
    }
    if(nrcuv==0)
        fout<<0;
    else
        fout<<(int)(nrcar/nrcuv);;
    fin.close();
    fout.close();

    return 0;
}