#include <fstream>
#include <string.h>

using namespace std;

char S[1024*1024+3];

int litera(char c){
	if (c >='a' && c<='z')
		return 1;
	if (c >='A' && c<='Z')
		return 1;
	return 0;
}


int litere, cuv, i;
int main() {
	ifstream f("text.in");
	ofstream g("text.out");
	f.get(S, 1024*1024+1);
	for (i=0;S[i]!=0;i++) {
		if (litera(S[i]))
			litere++;
		if (litera(S[i]) && !litera(S[i+1]))
			cuv++;
	}
	g<<litere/cuv;
	return 0;
}