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