#include <bits/stdc++.h>
using namespace std;
#include <ext/pb_ds/assoc_container.hpp>
using namespace __gnu_pbds;
//#include "light.h"
#define int long long
typedef pair<int,int> pii;
typedef vector<int> vi;
typedef vector<pii> vii;
typedef vector<bool> vb;
typedef long long ll;
typedef pair<ll,ll> pll;
typedef vector<pll> vll;
typedef tree<pii,null_type,less<pii>,rb_tree_tag,
tree_order_statistics_node_update> oset;
#define fi first
#define se second
#define pb push_back
#define pf push_front
#define mid (l+r)/2
#define all(x) x.begin(),x.end()
#define FOR(i,a) for(int i=0;i<(a);i++)
#define FORE(i,a,b) for(int i=(a);i<(b);i++)
#define cont(x) for(auto el:x) cout<<el<<' ';cout<<endl;
#define contp(x) for(auto el:x) cout<<el.fi<<'-'<<el.se<<' ';cout<<endl;
#define sp <<" "<<
#define DEBUG(x) cout<<(#x) sp x<<endl
#define carp(a,b) (((a%MOD)*(b%MOD))%MOD)
#define topla(a,b) (((a%MOD)+(b%MOD))%MOD)
const ll INF=1e18;
const int MAXN=1e5+5;
const int MOD=1e9+7;
int say[MAXN][3];
/*
0--> fark yok
1--> solda 1 fazla var
2--> sagda 1 fazla var
*/
signed main(){
ios_base::sync_with_stdio(false);
cin.tie(0);
cout.tie(0);
int n,s,t;
cin>>n>>s>>t;
vii a(n+1);
FORE(i,1,n+1){
cin>>a[i].fi>>a[i].se;
}
vii ans;
FORE(i,1,n+1){
int bir=a[i].fi;
int iki=a[i].se;
if(bir==iki) {ans.pb(a[i]);continue;}
if(say[bir][0]>say[bir][1]){
ans.pb({iki,bir});
say[bir][1]++;
say[iki][0]++;
}
else if(say[bir][0]<say[bir][1]){
ans.pb({bir,iki});
say[bir][0]++;
say[iki][1]++;
}
else if(say[iki][0]<say[iki][1]){
ans.pb({iki,bir});
say[bir][1]++;
say[iki][0]++;
}
else if(say[iki][0]>say[iki][1]){
ans.pb({bir,iki});
say[bir][0]++;
say[iki][1]++;
}
else{
ans.pb(a[i]);
say[bir][0]++;
say[iki][1]++;
}
}
for(auto el:ans) cout<<el.fi sp el.se<<endl;
}
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