#include <fstream>
#include <cstring>
using namespace std;
ifstream f("text.in");
ofstream g("text.out");
char a[1048580];
int s, nr, n;
int main()
{
	f.get(a,1048579,'\n');
	n=strln(a);
    if ((a[0]>='A' && a[0]<='Z') || (a[0]>='a' && a[0]<='z')) s++;
	for(int i=1; i<n; i++)
	        if((a[i]>='A' && a[i]<='Z' ) || (a[i]>='a' && a[i]<='z')) s++; 
                          else  
                                      if((a[i-1]>='A' && a[i-1]<='Z') || ( a[i-1]>='a' && a[i-1]<='z')) nr++;     
    g<<s/nr; g.close();
    return 0;
}