#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);

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


         }
    else
        {if(isalpha(ultimal)&& (isalpha(sir[i]) == 0))
          contor2++;
        }
        ultimal=sir[i];
        }


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


}