#include <iostream>
#include <fstream>
#include <cstring>
using namespace std;

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

int main()
{
    int length=0, words=0;
    char c, anterior;

    while(fin.get(c))
    {
        if((anterior>='a'&&anterior<='z')||(anterior>='A'&&anterior<='Z'))
            if((c<'a'||c>'z')&&(c<'A'||c>'Z'))
                words++;

        if((c>='a'&&c<='z')||(c>='A'&&c<='Z'))
            length++;

        anterior=c;
    }

    fout << length/words;
    return 0;
}