#include <fstream>
#include <cstring>
#include <cctype>

using namespace std;

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

char s[256];
int n , i , numarlitere ,  numarcuvinte;

int main()
{
    f.getline (s , 256);
    n = strlen (s);
    for(i = 0 ; i <= n ; ++i)
    {
        if( isalpha( s [i] ) )
           ++ numarlitere;
        else if (!isalpha (s[i] ) && isalpha(s[i-1]))
            ++ numarcuvinte;

    }
    if(numarlitere > 0)
    g<<numarlitere/numarcuvinte;
    else g<<0;
    return 0;
}