#include <iostream>
#include <stdio.h>
#include <string.h>
using namespace std;

FILE *fin=fopen("text.in","r");
FILE *fout=fopen("text.out","w");

int main()
{
    int nrCuvinte=0,lungimeCuvant=0,lungimeTotala=0;
    char cuvant[1000000];

    while(fscanf(fin,"%s ",&cuvant)>0)
    {
        lungimeCuvant=strlen(cuvant)-1;
        lungimeTotala=lungimeTotala+lungimeCuvant;
        nrCuvinte++;
    }

    fprintf(fout,"%d",lungimeTotala/nrCuvinte);
}