#include <fstream>
#include <cstring>
#include <stdio.h>
#define nmax 100500

using namespace std;
ifstream f("text.in");
ofstream g("text.out");
char s[nmax];
int nrCuv, nrLitere, lungSir;
int main()
{
int i;char ch;
bool nouCuv = false;
    while(f.get(ch)){
        if(isalpha(ch)){
            ++nrLitere;
            if(!nouCuv){
                nouCuv = true;
                ++nrCuv;
            }
        }
        else nouCuv = false;
    }
    if(nrCuv)
        g<< nrLitere / nrCuv << '\n';
    else g<< 0 <<'\n';
    return 0;
}