#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef pair<ll, ll> lpair;
const ll MOD = 1e9 + 7;
const ll INF = 1e18;
#define rep(i,m,n) for(ll i = (m); i < (n); i++)
#define rrep(i,m,n) for(ll i = (m); i >= (n); i--)
#define print(x) cout << (x) << endl;
#define print2(x,y) cout << (x) << " " << (y) << endl;
#define printa(x,n) for(ll i = 0; i < n; i++){ cout << (x[i]) << " ";} cout<<endl;

bool comp(pair<string, string> p1, pair<string, string> p2){
    if(p1.first == p2.first){
        return p1.second < p2.second;
    }
    return p1.first < p2.first;
}
int main(){
    cin.tie(0);
    ios::sync_with_stdio(false);
    ll N;
    cin >> N;
    string S[55], id[55];
    vector< pair<string, string> >lp;
    rep(i,0,N){
        cin >> S[i] >> id[i];
        lp.push_back(make_pair(S[i], id[i]));
    }
    sort(lp.begin(), lp.end(), comp);
    rep(i,0,N){
        cout << lp[i].first << " " << lp[i].second << endl;
    }
    
}