#include <iostream>
#include <fstream>
#include <cstring>

using namespace std;

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

int main()
{
    char x;
    int mxlung=0,nrcuv=0,lung=0;
    while(in.get(x))
    {
        if(x>=65 && x<=90 || x>=97 && x<=122)
            lung++;
        else if(lung!=0)
            nrcuv++,mxlung+=lung,lung=0;
    }
    out<<mxlung/nrcuv;
    return 0;
}