#include<bits/stdc++.h>

using namespace std;
using ll=long long;
#define rep2(i, a, n) for(int i = (a); i < (n); i++)
#define rep(i, n) rep2(i,0,n)

int main(){
  cin.tie(nullptr);ios_base::sync_with_stdio(false);
  int n;cin>>n;
  string s,id;
  pair<string,string> p[n];
  rep(i,n){
    cin>>s>>id;
    p[i]=make_pair(s,id);
    p[i].first=s;
    p[i].second=id;
  }
  sort(p,p+n);
  rep(i,n){
    cout<<p[i].first<<" "<<p[i].second<<endl;
  }
}