#include<stdio.h>
#include<string.h>
#include<ctype.h>
int main ()
{
    freopen("text.in","r",stdin);
    freopen("text.out","w",stdout);
    int n,i,k,c,cuv=0,lit=0;
    c==0;
    char a;
     while(scanf("%c",&a)!=EOF)
    {
                       if(isalpha(a)==1 || isalpha(a)==2)
                       {
                                        lit++;
                       if(c==0)
                       {
                            cuv++;
                                    c=1;
                       }
                       }
                       else
                       c=0;
                       }
              //         if(c==0 && isalpha(a)!=0)
                 //      cuv++;
                       printf("%d\n",lit/cuv);
                       return 0;
                       }
/*
for(i=1;i<=1000;i++)
{
                    printf("%c %d\n",i,isalpha((char)i));
                   } return 0;
                    }
*/