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

struct Student{
    int no;
    int score;
};
bool compared(Student std1,Student std2){
    if(std1.score==std2.score)
        return std1.no<std2.no;
    return std1.score<std2.score;
};

int main(){
    Student student[100];
    int N;
    cin>>N;
    for(int i=0;i<N;i++){
        cin>>student[i].no>>student[i].score;
    };
    sort(student,student+N,compared);
    for(int i=0;i<N;i++){
        cout<<student[i].no<<' '<<student[i].score<<endl;
    }
}