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

using namespace std;

ifstream f("text.in");
ofstream g("text.out");

char s[100000];

int sm=0,cuv=0;

int main()
{
    f.getline(s,100000);

    char* p;

    p=strtok(s," .,/;-=+[]{}");

    while(p){
      sm+=strlen(p);
      ++cuv;
      p=strtok(0," .,/;-=+\|[]{}");
    }

    g<<sm/cuv;

    return 0;
}