#include <iostream> #include <algorithm> using namespace std; typedef long long LL; int n, m; string s[505]; int main() { cin >> n >> m; for (int i = 1; i <= n; i++) for (int j = 1; j <= m; j++) { char ch; cin >> ch; s[i] += ch; } sort(s + 1, s + n + 1); for (int i = 1; i <= n; i++) { for (int j = 0; j < m; j++) cout << s[i][j] << " "; cout << endl; } return 0; }