#include<bits/stdc++.h> using namespace std; long long a[100005]; int main(){ int n; cin >> n; for(int i = 1;i <= n;i++){ long long c, b; cin >> c >> b; a[i] = (c * 100000) + b; } sort(a + 1,a + 1 + n); for(int i = 1;i <= n;i++){ long long b = a[i] % 100000; a[i] -= b; long long c = a[i] / 100000; cout << c << " " << b << endl; } return 0; }