#include<cstdio>

int main()
{
    int l=0,w=0,s=0;
    char c;
    freopen("text.in","r",stdin);
    freopen("text.out","w",stdout);
    c='~';
    while(scanf("%c",&c)>0)
    {
        if(c>='A' && c<='Z' || c>='a' && c<='z')
            l++;
        else   if(l>0)
                {
                    w++;
                    s=s+l;
                    l=0;

                }
    }
    printf("%d",s/w);
    return 0;
}