#include <bits/stdc++.h>

using namespace std;
ifstream fin("text.in");
ofstream fout("text.out");
char c;
void Rez()
{
    int contor=0,nrc=0,r=0;
    while(fin.get(c))
    {
        if(('a'<=c and c<='z')|| ('A'<=c and c<='Z'))
        {
            contor++;
            r=1;
        }
        else if(r==1)
            {
                nrc++;
                r=0;
            }
    }
    fout<<contor/nrc<<"\n";
}
int main()
{
    Rez();
    fin.close();
    fout.close();
    return 0;
}