#include <iostream>
#include <fstream>
#include <cstring>

using namespace std;

ifstream fin("text.in");
ofstream fout("text.out");


int main()
{
    int s=0,nr=0;
    char val;
    bool first=true;
    while(fin.get(val))
    {
        if(isalpha(val))
        {
            s++;
            if(first == true)
            {
                nr++;
                first = false;
            }
        }
        else
        {
            first = true;
        }
    }

    fout<<s/nr;
    return 0;
}