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

using namespace std;
ifstream fin("text.in");
ofstream fout("text.out");
int main()
{
    char Cuv[100000],Sep[]=" ,.<>/?;:'[{]}\|=+-_)(*&^%$#@!`~\n",*coovant;int nrlit=0,nrcuv=0;
    fin.get(Cuv,100000);
    coovant=strtok(Cuv,Sep);
    while(coovant!=NULL)
    {
        nrlit+=strlen(coovant),nrcuv++;
        coovant=strtok(NULL,Sep);
    }
    fout<<nrlit/nrcuv;
    return 0;
}