#include<cstdio>
#include<cstring>
char v[2000001];
int main ()
{freopen ("text.in","r",stdin);
freopen ("text.out","w",stdout);
int c=0,l=0,i,n;
gets(v);
n=strlen(v);
for(i=0;i<n;i++)
    {if((v[i]<='z'&&v[i]>='a')||(v[i]<='Z'&&v[i]>='A'))
        {c++;
        while((v[i]<='z'&&v[i]>='a')||(v[i]<='Z'&&v[i]>='A'))
            {i++;
            l++;
            }
        i--;
        }
    }
printf("%d",l/c);
return 0;
}