#include <iostream>
#include <fstream>

using namespace std;

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

char lit;
int lt,cuv,ok;
int main()
{
    while(in.get(lit))
    {
        if((lit>='A' && lit<='Z') || (lit>='a' && lit<='z')) {lt++, ok=1;}
        else{
            if(ok==1) cuv++;
            ok=0;
        }
    }
    out<<lt/cuv;

    in.close();
    out.close();
    return 0;
}