#include<cstdio>
#include<cstring>
int n,i,nr,nrcuv;
char a[500002];
using namespace std;
int main()
{
    freopen("text.in","r",stdin);
    freopen("text.out","w",stdout);
    gets(a);
    n=strlen(a);
    for(i=0;i<n;i++)
    {
        if((a[i]>='a'&&a[i]<='z')||(a[i]>='A'&&a[i]<='Z'))nr++;
    }
    a[n]='!';
    n++;
    for(i=0;i<n-1;i++)
    {
        if((a[i]>='a'&&a[i]<='z')||(a[i]>='A'&&a[i]<='Z'))
        {
            if(a[i+1]<'a'||a[i+1]>'z')
            {
                if(a[i+1]<'A'||a[i+1]>'Z')
                {
                    nrcuv++;
                }
            }
        }
    }
    printf("%d",nr/nrcuv);
    return 0;
}