#include <fstream>
using namespace std;
char s[]="1234567890qwertyuioplkjhgfdsazxcvbnmMNBVCXZASDFGHJKLPOIUYTREWQ";
int v(char c)
{
	for (int i=0;i<62;i++)
		if (s[i]==c) return 1;
	return 0;
}
int main()
{
	unsigned long long count=0,nr=0,cuv=0;
	bool a=0;
	char c;
	ifstream f("text.in");
	ofstream o("text.out");
	f>>noskipws>>c;
	if (v(c)) {a=1;cuv++;}
	while (f>>noskipws>>c)
	{
		if (v(c)) count++;
		if (a && !v(c)) nr++;
		a=v(c);
	}
	if (a) nr++;
	if (nr!=0) {count/=nr;
	o<<count;}
	else o<<"0";
	return 0;
	
}