#include <fstream>
#include <vector>
#include <bitset>
#include <unordered_map>
#include <algorithm>
#include <queue>
#include <math.h>
#include <iomanip>
#include <stack>
  
using namespace std;

ifstream cin("text.in");
ofstream cout("text.out");

int words;
int letters;

int main()
{
	char c;
	int prev = 0;
	
	while(cin.get(c))
	{
		if(isalpha(c))
		{
			if(prev == 0)
				words++;
			letters++;
			prev = 1;
		}
		else
			prev = 0;
	}
	
	words += prev;
	
	cout << letters / words;
}