#include<stdio.h>

int main()
{
	FILE *f = fopen("text.in", "r");
	FILE *g = fopen("text.out", "w");
	
	char ch;
	int ok = 0;
	int count = 0;
	int sum = 0;
	
	do
	{
		fscanf(f, "%c", &ch);
		
		if((ch>='a' && ch <='z') || (ch>='A' && ch <='Z'))
		{
			sum++;
			if(!ok)
			{
				ok = 1;
				count++;
			}
		}
		else if (ok)
			ok = 0;
	}
	while(ch != '\n');
	
	fprintf(g, "%d", sum/count);
	
	return 0;
}