#include<stdio.h>
#include<ctype.h>
#include<string.h>
char s[1000005];
int main()
{
    freopen("text.in","r",stdin);
    freopen("text.out","w",stdout);
    unsigned n,i,m=0,l=0;
    gets(s);
    n=strlen(s);
    for(i=0;i<n;i++)
    {
        m++;
        while(isalpha(s[i]) || s[i]=='-')
        {
            i++;
            if(s[i]!='-')
                l++;
        }
    }
    printf("%u\n",l/m);
    return 0;
}