#include <iostream>
#include <cstring>
#include <fstream>

using namespace std;

ifstream fin("text.in");
ofstream fout("text.out");

char s[10000];
int media, cnt, cntc;
int main(){
    fin.getline(s, 10000);
    char sep[] = "_ 1234567890,.?/!;\'-@#$%^&*(){}[]|:<>+~`" ;
    char *p = strtok(s, sep);
    while(p)
    {
        cnt++;
        for(int i  = 0; i < strlen(p); i++)
            cntc++;

        p = strtok(NULL, sep);
    }
    if(cnt == 0)
        fout<<0;
    else
    {
        media = cntc/ cnt;
        fout<<media;
    }

return 0;
}