#include<cstdio>
int lit,cuv;
char c,l;
int main()
{
    freopen("text.in","r",stdin);
    freopen("text.out","w",stdout);
    scanf("%c",&c);//daca e linie de dialog
    if(c>='A' && c<='Z' || c>='a' && c<='z')
    {
        lit++;
        cuv++;
    }
    while(scanf("%c",&l)!=EOF)
    {
        if(!(l>='A' && l<='Z' || l>='a' && l<='z'))
        {
            c = l;
            continue;//mare instuctiune de smecher
        }
        lit++;
        if(!(c>='A' && c<='Z' || c>='a' && c<='z'))
            cuv++;
        c=l;
    }
    printf("%d",lit/cuv);
    return 0;
}