#include<iostream>
#include<vector>
#include<algorithm>
#include<cmath>
#include<string>
#include<iomanip>
#include<numeric>
#include<queue>
#include<deque>
#include<stack>
#include<set>
#include<map>
using namespace std;
typedef long long ll;
const int mod=1e9+7;
int main(){
	int n,m,a;
	string s;
	cin>>n>>m;
	map<string,int>mp;
	while(cin>>s>>a)
		mp[s]=a;
	for(auto[s,a]:mp)
		cout<<s<<' '<<a<<endl;
}