#include <iostream>
#include <cstring>
#include <fstream>
using namespace std;
ifstream f("text.in");
ofstream g("text.out");
int main()
{
    int i,n,nr=0,nr1=0;
    char s[1000001];
    f.getline(s,1000001);
    n=strlen(s);
    s[n]=' ';
    s[n+1]=NULL;
    for(i=0;i<strlen(s);i++)
    {
        if((s[i]>='a'&&s[i]<='z')||(s[i]>='A'&&s[i]<='Z')||(s[i]>='a'&&s[i]<='z')||(s[i]>='A'&&s[i]<='Z'))
        nr++;
      if(s[i]==' ')
        nr1++;
    }
    g<<nr/nr1;
    return 0;
}