25 lines
354 B
C++
25 lines
354 B
C++
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#include<bits/stdc++.h>
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using namespace std;
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using ll = long long;
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void solve()
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{
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int l,r;
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cin>>l>>r;
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if(2*l>r)
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cout<<-1<<" "<<-1<<endl;
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else
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cout<<l<<" "<<2*l<<endl;
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}
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int main()
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{
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ios_base::sync_with_stdio(false);
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cin.tie(nullptr);
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int TC = 1;
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cin >> TC;
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cin.ignore();
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while (TC--) solve();
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}
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