#include <fstream>
#include <cctype>
using namespace std;
ifstream f("text.in");
ofstream g("text.out");

char s[1200000];
int m,i,cuv,lit;
int main()
{
    f.getline(s,1200000);
    while(s[i])
    {
        if(isalpha(s[i]))
        {
            cuv++;
            while(isalpha(s[i]))
            {
                lit++;
                i++;
            }
        }
        i++;
    }
    if(lit==0)
        m=0;
    else
        m=lit/cuv;
    g<<m;
    return 0;
}