#include <fstream>
#include<string.h>

#include<stdlib.h>
using namespace std;
ifstream f("text.in");
ofstream g("text.out");
char s[900000],*cuv;
int nr=0,lung_medie=0,lung_totala=0;
int main()
{
    f.get(s,900000);
    cuv=strtok(s," ,.;:-!/?'012345678""9()[]#@$%^&*\|_+=<>");
    while(cuv){
        nr++;
        lung_totala+=strlen(cuv);
        cuv=strtok(NULL," ,.;:-!/?'012345678""9()[]#@$%^&*\|_+<>=");
    }
    if(nr)
        lung_medie=lung_totala/nr;
    else
        lung_medie=0;
    g<<lung_medie;
    return 0;
}