if (rslt.length()) rslt += " ";
string ch = rwy.substr(ii,1);
if (isdigit(ch[0])) rslt += ConvertNumToSpokenDigits(atoi(ch.c_str()));
if (rslt.length()) rslt += " ";
string ch = rwy.substr(ii,1);
if (isdigit(ch[0])) rslt += ConvertNumToSpokenDigits(atoi(ch.c_str()));