#include<stdio.h>

char ch;
long int i,j,nrl,nrc,ok;

int main(void)
{
    freopen("text.in","r",stdin);
    freopen("text.out","w",stdout);


    while((ch=getchar())!=EOF)
    {
        if((ch>='a'&&ch<='z')||(ch>='A'&&ch<='Z'))
          nrl++;
          else
          {nrc++;ok=1;
          while(ok==1&&ch!=EOF)
          {ch=getchar();
              if((ch>='a'&&ch<='z')||(ch>='A'&&ch<='Z'))
              {
                  ok=0;
                  nrl++;
              }
          }
          }
    }
    nrc--;
    //printf("c= %i\n",nrc);
    //printf("l= %i\n",nrl);
   printf("%ld",nrl/nrc);
   return 0;
}