#include<iostream>

#include<algorithm>

#include<cstring>

#include<cstdio>

#include<set>

#define Maxn 100010

using namespace std;

struct Monk{

    int id,g;

    int operator <(const Monk &temp) const

    {

        return g<temp.g;

    }

};

multiset<Monk> q;

multiset<Monk> :: iterator it,it1;

int main()

{

    int n,i,j,g,k,x;

    Monk temp;

    while(scanf("%d",&n),n)

    {

        q.clear();

        temp.id=,temp.g=;

        q.insert(temp);

        for(i=;i<=n;i++)

        {

            scanf("%d%d",&k,&g);

            temp.id=k,temp.g=g;

            it=q.lower_bound(temp);

            if(it==q.begin())

            {

                printf("%d %d\n",k,it->id);

            }

            else{

                it1=it;

                it--;

                if(it1->g-g<g-it->g)

                {

                    printf("%d %d\n",k,it1->id);

                }

                else

                {

                    printf("%d %d\n",k,it->id);

                }

            }

            q.insert(temp);

        }

    }

    return ;

}