#include <fstream>
#include <cstring>
#define nmax 101
using namespace std;
ifstream fin("text.in");
ofstream fout("text.out");


void Solve()
{char s[10001],*p,cuv[10001],sep[]=" ,./?:;+'-=]()*&^%$#@!|\"";
 int sum=0,nr=0;
 fin.getline(s,10001);
 p=strtok(s,sep);
 while(p!=NULL)
 {strcpy(cuv,p); p=strtok(NULL,sep);
  sum+=strlen(cuv);
  nr++;
 }
 fout<<sum/nr<<endl;
}

int main()
{Solve();
 return 0;
}