#include<stdio.h>   
#include<string.h>   
#include<ctype.h>   
int main ()   
{   
    freopen("text.in","r",stdin);   
    freopen("text.out","w",stdout);   
    long long int n,i,k,c,cuv=1,lit=1;
    c==0;   
    char a;   
    while(scanf("%c",&a)!=EOF)   
    {                 if(isalpha(a)>=1)
    {lit++;   
        if(c==0)   
        {   
            //  if(strchr('- .,;:"()',a[i]))   
            cuv++;   
            c=1;   
        }   
    }   
        if(isalpha(a)==0)
            c=0;   
    }   
    if(c==0 && isalpha(a)!=0)   
        cuv++;   
    printf("%d\n",(lit-1)/(cuv-1));   
    return 0;   
}