#include <iostream>
#include <cstring>
#include <fstream>
using namespace std;
char c;
ifstream fin("text.in");
ofstream fout("text.out");
int main()
{
 int cuv=0, lit=0, ok=0;
 while(fin.get(c))
{
    if(ok==0) {
    if((c >= 'a' && c <='z') || (c >= 'A' && c <= 'Z' ))
    {
        cuv++;
        lit++;
        ok=1;
    }
    }
    else if(ok==1)
    {
        if((c >= 'a' && c <='z') || (c >= 'A' && c <= 'Z' ))
        lit++;
        else ok=0;
    }
}
fout<< lit/cuv;
fin.close();
fout.close();
    return 0
    ;
}