#include <iostream>
#include <string.h>
#define DIM 10000
#include <fstream>
using namespace std;
int main()
{
    ifstream cin ("text.in");
    ofstream cout ("text.out");
    char s[DIM], *p;
    int nr1 = 0, nr2 = 0;
    cin .get(s, DIM);
    cin .get();
    for (int i=0; i<=strlen(s)-1; i++)
        if (isalpha(s[i]))
            nr1 ++;
    p = strtok(s, " ");
    while (p){
        nr2 ++;
        p = strtok(NULL, " ");
    }
    cout << nr1 / nr2;
    return 0;
}