//#include <iostream>
#include <fstream>
#include <cstring>
using namespace std;

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

int main()
{
    int nrc=0,l=0,i=0;
    char s[1000];
    in.getline(s,1000);
    while(i<strlen(s))
    {
        if(isalpha(s[i]))
        {
            while(isalpha(s[i]))
                ++l,++i;
            ++nrc;
        }
        i++;
    }
    out<<l/nrc;

    return 0;
}