#include <fstream>
#include <string>
#define MAX 1000000

using namespace std;

char t[MAX];
    
int main() {
    ifstream f("text.in");
    ofstream g("text.out");
    int len, i, nrWord = 0, nrLetter = 0;
    f.get(t,MAX);
    //g << t << endl;
    //g << t[strlen(t)-2] << t[strlen(t)-1] << "c" << endl;
    len = strlen(t);
    i = 0;
    
    while ( i < len ) {
        if ( isalpha(t[i]) ) { nrLetter++; if ( i == len - 1 ) nrWord++; }
        else 
            if ((i != 0) && isalpha(t[i-1])) nrWord++;
        i++;
    }
    
    /*while ( i < len ) {
          while ( (i < len) && (isalpha(t[i])) ) { //(((t[i] >= 'a') && (t[i] <= 'z')) || ((t[i] >= 'A') && (t[i] <='Z'))) ) {
                i++;
                nrLetter++;
          }
          if ( nrLetter > 0 ) nrWord++;
          while ( (i < len) && !(isalpha(t[i])) ) { //(!(((t[i] >= 'a') && (t[i] <= 'z')) || ((t[i] >= 'A') && (t[i] <='Z')))) ) {
                i++;
          }
    }
    */
    if ( !nrWord ) 
        g << 0;
    else {
//        g << "litere : " << nrLetter << endl;
//        g << "cuvinte : " << nrWord << endl;       
        g << nrLetter / nrWord;    
    }
    
    return 0;
}