#include <iostream>
#include <fstream>
#include <cstring>
#include <cctype>
using namespace std;
int nr,len;
int main()
{
    ifstream fin("text.in");
    char c;
    bool word=0;
    while(fin.get(c))
    {
        if(isalpha(c))
        {
            ++len;word=1;
        }
        else if(word==1)
        {
            ++nr;
            word=0;
        }
    }
    ofstream fout("text.out");
    fout<<len/nr;
    return 0;
}