#include <iostream>
#include <fstream>
#include <string>
#include <cstring>
#include <ctype.h>
using namespace std;
ifstream in("text.in");
ofstream out("text.out");
char t[100000];
int main()
{
    int nrcuv=1,nrlitere=0,n;
    in.getline(t,100000);
    n=strlen(t);
    for(int i=0;i<n;i++)
    {
        if(t[i]==' ')
            nrcuv++;
        if(isalpha(t[i]))
            nrlitere++;
    }
    out<<nrlitere/nrcuv;
    return 0;
}