#include <iostream>
#include <string>
using namespace std;
int main()
{
    string s;
    getline(cin, s);
    int cnt = 0;
    for (int i = 0; i < int(s.size()); i++)
    {
        if (s[i] == '.')
        {
            cnt++;
        }
        else if (!isdigit(s[i]))
        {
            cout << "Bad string" << endl;
            return 0;
        }
    }
    if (cnt > 1)
    {
        cout << "Bad string: too many dots" << endl;
        return 0;
    }
    cout<<"It seems that string is good :-)" << endl;
    return 0;
}