#include<stdio.h>
#include<string.h>
char a[1001];
long nrl,nrc,n,i;
int main()
{
    freopen("text.in","r",stdin);
    freopen("text.out","w",stdout);
    gets(a);
    n=strlen(a)-1;
    for(i=0;i<=n;i++)
                     if( (a[i]>='A' && a[i]<='Z') || (a[i]>='a' && a[i]<='z') )
                     {
                         nrl++;
                     }
                     else if( (a[i-1]>='A' && a[i-1]<='Z') || (a[i-1]>='a' && a[i-1]<='z') )
                     {
                          nrc++;
                     }
    printf("%ld",nrl/nrc);
    return 0;
}