#include <iostream>
#include <fstream>
using namespace std;
ifstream f("text.in");
ofstream g("text.out");
string v[1000000];
unsigned long long i=1,u,n,k;
int main()
{
    while (f>>v[i]) i++;
    for (u=1;u<i;u++)
        {n=n+v[u].length(); k++;}
        g<<n/k;
    return 0;
}