#include <iostream>
#include <cstring>
#include <fstream>

using namespace std;

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

char s[101],*p;
int x,nr,nr2,c;
int main()
{
    int i;
    f.getline(s,101);
    x=strlen(s);
    for(i=0;i<x;i++)
        if((s[i]>='a' && s[i]<='z') or (s[i]>='A' && s[i]<='Z'))
            nr++;


    p=strtok(s," ");
    while(p!=NULL)
    {
    nr2++;
    p=strtok(NULL," ");
    }


        c=nr/nr2;



    g<<c;
    return 0;
}