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package com.todd.nowcoder;

import java.util.Map;

import java.util.Scanner;

import java.util.TreeMap;

/**

* @author tongchengdong

* @description 合并表记录

* @date 9:28 PM 2022/7/2

*/

public class HJ8 {

public static void main(String[] args) {

Scanner sc = new Scanner(System.in);

while (sc.hasNext()) {

int next = sc.nextInt();

TreeMap<Integer, Integer> map = new TreeMap<>();

for (int i = 0; i < next; i++) {

int key = sc.nextInt();

int value = sc.nextInt();

map.put(key, map.getOrDefault(key, 0) + value);

}

for (Map.Entry<Integer, Integer> entry : map.entrySet()) {

System.out.println(entry.getKey() + " " + entry.getValue());

}

}

}

}