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

char s[8400000];

int tc,nrcuv;

int main()
{
    int i;
    in.getline(s,8400000);
    for(i=0;s[i]!=NULL;i++)
    {
        if(isalpha(s[i]))
        {
            nrcuv++;
            while(isalpha(s[i]))
                {
                    tc++;
                    i++;
                }
        }
    }
    if(nrcuv==0)
        out<<0;
    else
        out<<tc/nrcuv;
    return 0;
}