#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=1,lit=1;
    c==0;   
 char a;   
  while(scanf("%c",&a)!=EOF)   
    {                 if(isalpha(a)>0)
                       {lit++;   
                       if(c==0)   
                       {   
                             //  if(strchr('- .,;:"()',a[i]))   
                               cuv++;   
                                    c=1;   
                       }   
                       }   
                       else   
                       c=0;   
                       }   
                       if(c==0 && isalpha(a)!=0)   
                       cuv++;   
                       printf("%d\n",(lit-1)/(cuv-1));   
                       return 0;   
                       }