#include<stdio.h>
#include<string.h>
char s[100001];
long n,i,nrf,nrc;
int main()
{
    freopen("text.in","r",stdin);
    freopen("text.out","w",stdout);
    gets(s);
    n=strlen(s)-1;
    for(i=0;i<=n;i++)
                     if((s[i]>='A' && s[i]<='Z') || (s[i]>='a' && s[i]<='z'))
                                   nrf++;
                     else
                     {
                          if((s[i-1]>='A' && s[i-1]<='Z') || (s[i-1]>='a' && s[i-1]<='z'))
                                         nrc++;
                     }
    nrc++;
    printf("%ld",nrf/nrc);
    return 0;
}