Hey guys, here a more compact solution:

include

using namespace std;

string ltrim(const string &); string rtrim(const string &);

int main() { string n_temp; getline(cin, n_temp);

int n = stoi(ltrim(rtrim(n_temp)));

string numbers[] = {"one", "two", "three", "four", "five", "six", "seven", "eight", "nine"};

if (n >= 1 && n <= 9){
    cout << numbers[n-1] << endl;
}
else {
    cout << "Greater than 9";
}





return 0;

}

string ltrim(const string &str) { string s(str);

s.erase(
    s.begin(),
    find_if(s.begin(), s.end(), not1(ptr_fun<int, int>(isspace)))
);

return s;

}

string rtrim(const string &str) { string s(str);

s.erase(
    find_if(s.rbegin(), s.rend(), not1(ptr_fun<int, int>(isspace))).base(),
    s.end()
);

return s;

}