#include <iostream>
#include <math.h>
#include <fstream>

using namespace std;

ifstream f("text.in");
ofstream g("text.out");

int main()
{
    char s;
    int cuv = 1, ltot = 0;
    while (cin.get(s))
    {
        if (s == ' ')
        {
            cuv = cuv + 1;
        }
        else
        {
            if ((s >= 'a' && s <= 'z') | (s >= 'A' && s <= 'Z'))
            {
                ltot = ltot + 1;
            }
            
        }
    }
    g<<ltot / cuv;
    return 0;
}