#include<iostream>
#include<algorithm>
using namespace std;

typedef struct{
    int index;
    int score;
}Person;

const int N = 10010;
Person person[N];

bool cmp(Person a,Person b){
    if(a.score!=b.score)    return a.score<b.score;
    else    return a.index<b.index;
}

int main(){
    int n;
    cin>>n;

    for(int i=0;i<n;i++){
        cin>>person[i].index>>person[i].score;
    }

    sort(person,person+n,cmp);

    for(int i=0;i<n;i++){
        cout<<person[i].index<<" "<<person[i].score<<endl;
    }

}