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

using namespace std;


//#define FOR(i,a,b) for(i=a;b<=b;i++)

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


    char sir[1000000];
    f.get(sir,100000001,EOF);
    int ok=0;
    int lung = strlen(sir);

    int contor1=0;
    int contor2=0;
    for(int i = 0 ; i <=lung+1 ;i ++ )
       {
           if(isalpha(sir[i]))
         {contor1++;

           ok=1;
         }
    else
        {
            if(ok == 1)
                contor2++;
            ok=0;
        }

        }


       if(contor2 == 0 )
        g<<0;
       else
        g<<contor1/contor2;


}