#include <iostream>
#include <fstream>
#include <string.h>

using namespace std;
ifstream f("parantezare.in");
ofstream g("parantezare.out");

int main()
{
    char s[2000];
    int lit=0,cuv=0,ok=0,i,k=0;
    f.getline(s,2000);
     for(i=0;i<strlen(s);i++)
    {
    if((s[i]<='a'&&s[i]>='z')&&(s[i]<='A'&&s[i]>='Z'))
        k++;
    }
    while(k!=0)
    {
     if((s[i]>='a'&&s[i]<='z')||(s[i]>='A'&&s[i]<='Z'))
     {
     lit++;
     ok=1;
     }
     else
     {
        if(ok==1)
        cuv++;
         ok=0;
         }
    }
    g<<lit/cuv;
    return 0;
}