#include <fstream>
#include <cstring>
using namespace std;

#define NMax 1100000

ifstream f("text.in");
ofstream g("text.out");

char sir[NMax];
char c;
int n;
bool last = false;
int nrcuv, litere;

int main()
{
    int i;
    f.get(sir, 1090000);

    n = strlen(sir);
    for(i=0;i<n;++i)
    {
        c = sir[i];
        if( (c>='a' && c<='z') || (c>='A' && c<='Z') )
        {
            if(last == false) last = true, ++nrcuv;
            ++litere;
        }
        else last = false;
    }

    g<<litere / nrcuv<<"\n";

    f.close();
    g.close();
    return 0;
}