#include <cstdio>
#include <cstring>
using namespace std;

int main ()  {
	
	freopen ("text.in", "r", stdin);
	freopen ("text.out", "w", stdout);
	
	char *s = new char;

	int nr_cuv=0, nr_lit=0, i;
	fgets(s, 1000000000, stdin);
	for (i=0; i<=strlen(s)-1; i++) {
		if (('a'<=s[i] && s[i]<='z') || ('A'<=s[i] && s[i]<='Z')) {
			nr_lit++;
			if ( (0<=s[i-1] && s[i-1]<'A') || ('Z'<s[i-1] && s[i-1]<'a') || 'z'<s[i-1] ) {
				nr_cuv++;
			}
		}
		
	
	
	}
	
	printf ("%d", nr_lit/nr_cuv);
	
	return 0;
	
}