#include <fstream>
#include<cstring>

using namespace std;

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

char *p,s[1048576];
long i,n,nrcuvinte,nrlitere;

int main()
{
   f.getline(s,201);
    n=strlen(s);

    p=strtok(s," ,.-!");
    while(p)
    {
       nrcuvinte++;
       nrlitere=nrlitere+strlen(p);
        p=strtok(NULL," ,.!-");

    }
    g<<nrlitere/nrcuvinte;

    return 0;

}