#include<cstdio>
#include<ctype.h>
using namespace std;
int main()
{
    freopen("text.in","r",stdin);
    freopen("text.out","w",stdout);
    char ch;
    int l,c,last;
    l=c=0;
    last=0;
    while(scanf("%c",&ch)!=EOF)
    {
        if(isalpha(ch))
            l++;
        else
            if(l>0 && ch!=',')
                c++;
    }
    c--;
    printf("%d",l/c);
    return 0;
}