#include <bits/stdc++.h>
using namespace std;
int main() {
int N, S, T; cin >> N >> S >> T;
vector<int> fc(T,0 ), sc(T, 0);
for (int i = 0; i < N; i++) {
int a, b;
cin >> a >> b;
a--; b--;
if (fc[a] > sc[a]) {
sc[a]++;
fc[b]++;
cout << b+1 << " " << a+1;
} else {
sc[b]++;
fc[a]++;
cout << a+1 << " " << b+1;
}
cout << "\n";
}
}
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