#include <stdio.h>
#include <stdlib.h>

int main()
{
	freopen("text.in", "r", stdin);
	freopen("text.out", "w", stdout);

	char c;
	int k = 0, r = 0, ok = 0;

	while(scanf("%c", &c) == 1)
	{ 
		
		if((c >= 'a' && c <= 'z') || (c >= 'A' && c <= 'Z'))
		{
			k++;
			if(ok == 0)
			{
				ok = 1;
				r++;
			}
		}
		else if(ok)
			ok = 0;
	}
	printf("%d",k/r);
	return 0;
}