#include <fstream>
#include <cstdio>
using namespace std;
FILE *f=fopen("text.in","r+");
ofstream g("text.out");

int main()
{
    short k=0,L=0;
    char sir[255],*p,sep[]=" ,  - ! .   ";
    p=new char[255];
    fgets(sir,254,f);
    p=strtok(sir,sep);
    while(p!=NULL)
    {
        L+=strlen(p);
        k++;
        p=strtok(NULL,sep);
    }
    g<<L/k;
    g<<'\n';
    return 0;
}