#include <fstream>
#include <cstring>
using namespace std;
ifstream f ("text.in");
ofstream g ("text.out");
char a[99999999];
int k, z, n, i;
bool ok = false;
int main()
{
    f.get(a,99999999,'\n');
    n = strlen(a);
    for (i = 0; i < n; i++)
    {
        if(isalpha(a[i]))
        {
            while (isalpha(a[i]))
            {
                k++;
                i++;
            }
            z++;
        }
    }
    if(z == 0)
        g << 0;
    else
        g << k / z;
    return 0;
}