func_code_string: #include <bits/stdc++.h>   using namespace std;   using LL = long long;   constexpr int N = 1e5 + 5;   void solve() {     int a, b;     cin >> a >> b;     if (a * 2 <= b)       cout << a <<     << a * 2 <<   n ;     else       cout <<  -1 -1 n ;   }   int main() {     ios::sync_with_stdio(false);     cin.tie(nullptr);     int t;     cin >> t;     while (t--) solve();   }   