#include<stdio.h>
#include<ctype.h>
char x,xi;
long n,i,nrf,nrc;
int main()
{
    freopen("text.in","r",stdin);
    freopen("text.out","w",stdout);
    scanf("%c",&xi);
    if((x>='A' && x<='Z') || (x>='a' && x<='z'))
                                   nrf++;
    while(scanf("%c",&x)!=EOF)
    { 
                     if((x>='A' && x<='Z') || (x>='a' && x<='z'))
                                   nrf++;
                     else
                     {
                          if((xi>='A' && xi<='Z') || (xi>='a' && xi<='z'))
                                         nrc++;
                     }
                     xi=x;
    }
    if((xi>='A' && xi<='Z') || (xi>='a' && xi<='z'))
                  nrc++;
    printf("%ld",nrf/nrc);
    return 0;
}