#include<fstream>
using namespace std;
int main()
{
	ifstream in ("text.in");
	ofstream out("text.out");
	char c, ant;
	int s=0, nr=0;
	in.get(ant);
	if ((ant>='A' && ant<='Z') || (ant>='a' && ant<='z'))
		s++;
	while(in.get(c))
    {
        if((c>='A' && c<='Z' ) || (c>='a' && c<='z') )
			s++;
        else 
			if((ant>='A' && ant<='Z') || ( ant>='a' && ant<='z')) 
				nr++;
        ant=c;
    }
    if((c>='A' && c<='Z') || ( c>='a' && c<='z') )
		nr++;
    out<<s/nr;
    return 0;
}