#include <cstdio>
#include <cstring>
using namespace std;
int i,nrl,nrc;
char a[1000000];
int main()
{
    freopen("text.in","r",stdin);
    freopen("text.out","w",stdout);
    i=-1;
    while(a[i]!='\n')
    {
        i++;
        scanf("%c",&a[i]);
    }
    nrl=0;
    nrc=0;
    if(a[0]>='A'&&a[i]<='Z'||a[0]>='a'&&a[0]<='z')nrc++;
    for(i=0;i<=strlen(a)-1;i++)
        {
            if(a[i]>='A'&&a[i]<='Z'||a[i]>='a'&&a[i]<='z')nrl++;
            if(strchr("ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz",a[i])==0&&(a[i+1]>='A'&&a[i+1]<='Z'||a[i+1]>='a'&&a[i+1]<='z'))nrc++;
        }
    if(nrl==0)printf("0\n");
    else printf("%d\n",nrl/nrc);
    return 0;
}