#include <iostream>
#include <fstream>
#include <string>
using namespace std;
char x,n;
int s,s1;
bool w;
int main()
{
    ifstream f("text.in");
    ofstream g("text.out");
    f.get(x);
    if((x>='A' && x<='Z')||(x>='a' && x<='z')) {s++;w=1;}
    if(w && n==' ') s1++;
    n=x;
    while(f.get(x))
    {
    w=0;
    if((x>='A' && x<='Z')||(x>='a' && x<='z')) {s++; w=1;}
    if(w && n==' ') s1++;
    n=x;
    }
    s1++;
    g<<s/s1;
    return 0;
}