Lesson14

#include <iostream>
#include <string>
#include <tuple>

using namespace std;

int main0() {
  auto p = make_pair(1, 3);
  cout << p.first << " " << p.second << endl;

  auto [a, b] = make_pair(1, 3);
  cout << a << " " << b << endl;

  int c = 0, d = 0;
  tie(c, d) = make_pair(1, 3);
  cout << c << " " << d << endl;

  pair<int, int> p2{1, 3};  // = {1, 3};
  cout << p2.first << " " << p2.second << endl;
  return 0;
}

int main1() {
  string s;
  cin >> s;
  cout << s << endl;
  cout << s.length() << " " << s.size() << endl;
  for (char c : s) cout << c << " ";
  cout << endl;
  return 0;
}

int main3() {
  char c = '1';
  cout << c << endl;
  int i = c - '0';
  cout << i << endl;
  return 0;
}

int main4() {
  string s = "lnip123456";
  s.erase(2, 3);
  cout << s << endl;
  s.append(" Hello");
  cout << s << endl;
  s.insert(7, "789");
  cout << s << endl;
  s.replace(7, 4, "#########");
  cout << s << endl;
  string t = s.substr(4, 5);
  cout << t << endl;
  return 0;
}

int main() {
  string s; cin >> s;
  string t = s;
  reverse(t.begin(), t.end());
  cout << s + t << endl;
  return 0;
}