#include <iostream>
#include <fstream>
using namespace std;
ifstream in("text.in");
ofstream out("text.out");

char strang;
long lit, nr, k;

int main()
{
    while(in.get(strang) && strang != EOF){
        if(strang >= 'a' && strang <= 'z' || strang >= 'A' && strang <= 'Z'){
            lit++;
            if (k == 0){
                nr++;
                k = 1;
            }
        }
        else k = 0;

    }
    out<< lit/nr;
    return 0;
}