#include <fstream>
#include <iostream>
#define N (1 << 20)
using namespace std;
ifstream f("text.in");
ofstream g("text.out");
char S[N + 1];
int i, words, LungT;
int main()
{   f.getline(S, N + 1);
    for(i = 0; S[i] != 0; i++){
        if((S[i] >= 'a' && S[i] <= 'z') ||(S[i] >= 'A' && S[i] <= 'Z')){
            while((S[i] >= 'a' && S[i] <= 'z') ||(S[i] >= 'A' && S[i] <= 'Z')){
                LungT++;
                i++;
            }
            words++;
        }
    }
    g << LungT / words;
    return 0;
}