#include <iostream>
#include <fstream>
#include <cstring>
using namespace std;
char s[100000000];
int nr,len;
int main()
{
    ifstream fin("text.in");
    fin.getline(s,100000000);
    char *p=strtok(s," -.,<>?/\\;:\'\"!~");
    while(p)
    {
        nr++;
        len+=strlen(p);
        p=strtok(0," -.,<>?/\\;:\'\"!~");
    }
    ofstream fout("text.out");
    fout<<len/nr;
    return 0;
}