//#define NDEBUG
#include "bits/stdc++.h"
#include <iostream>
#include <string>
#include <unordered_map>
#include <unordered_set>
#include <array>
#ifdef _MSC_VER
#include <ppl.h>
#include <opencv2/core.hpp>
#include <opencv2/highgui.hpp>
#include <opencv2/imgproc.hpp>
#endif

using namespace std;

#define DUMPOUT cerr
#define dump(...) DUMPOUT<<"  ";DUMPOUT<<#__VA_ARGS__<<" :["<<__LINE__<<":"<<__FUNCTION__<<"]"<<endl;DUMPOUT<<"    ";dump_func(__VA_ARGS__)

using uint = unsigned; using ll = long long; using ull = unsigned long long; using pii = pair<int, int>; using pll = pair<ll, ll>; using pdd = pair<double, double>; using pss = pair<string, string>;
template <typename _KTy, typename _Ty> ostream& operator << (ostream& o, const pair<_KTy, _Ty>& m) { o << "[" << m.first << "," << m.second << "]"; return o; }
template <typename _KTy, typename _Ty> ostream& operator << (ostream& o, const map<_KTy, _Ty>& m) { if (m.empty()) { o << "[]"; return o; } o << "[" << *m.begin(); for (auto itr = ++m.begin(); itr != m.end(); itr++) { o << "," << *itr; } o << "]"; return o; }
template <typename _KTy, typename _Ty> ostream& operator << (ostream& o, const unordered_map<_KTy, _Ty>& m) { if (m.empty()) { o << "[]"; return o; } o << "[" << *m.begin(); for (auto itr = ++m.begin(); itr != m.end(); itr++) { o << "," << *itr; } o << "]"; return o; }
template <typename _Ty> ostream& operator << (ostream& o, const vector<_Ty>& v) { if (v.empty()) { o << "[]"; return o; } o << "[" << v.front(); for (auto itr = ++v.begin(); itr != v.end(); itr++) { o << "," << *itr; } o << "]"; return o; }
template <typename _Ty> ostream& operator << (ostream& o, const set<_Ty>& s) { if (s.empty()) { o << "[]"; return o; } o << "[" << *(s.begin()); for (auto itr = ++s.begin(); itr != s.end(); itr++) { o << "," << *itr; } o << "]"; return o; }
template <typename _Ty> ostream& operator << (ostream& o, const unordered_set<_Ty>& s) { if (s.empty()) { o << "[]"; return o; } o << "[" << *(s.begin()); for (auto itr = ++s.begin(); itr != s.end(); itr++) { o << "," << *itr; }	o << "]"; return o; }
template <typename _Ty> ostream& operator << (ostream& o, const stack<_Ty>& s) { if (s.empty()) { o << "[]"; return o; } stack<_Ty> t(s); o << "[" << t.top(); t.pop(); while (!t.empty()) { o << "," << t.top(); t.pop(); } o << "]";	return o; }
template <typename _Ty> ostream& operator << (ostream& o, const list<_Ty>& l) { if (l.empty()) { o << "[]"; return o; } o << "[" << l.front(); for (auto itr = ++l.begin(); itr != l.end(); ++itr) { o << "," << *itr; } o << "]"; return o; }
template <typename _KTy, typename _Ty> istream& operator >> (istream& is, pair<_KTy, _Ty>& m) { is >> m.first >> m.second; return is; }
template <typename _Ty> istream& operator >> (istream& is, vector<_Ty>& v) { for (size_t t = 0; t < v.size(); t++) is >> v[t]; return is; }
namespace aux { // print tuple
  template<typename Ty, unsigned N, unsigned L> struct tp { static void print(ostream& os, const Ty& v) { os << get<N>(v) << ","; tp<Ty, N + 1, L>::print(os, v); } };
  template<typename Ty, unsigned N> struct tp<Ty, N, N> { static void print(ostream& os, const Ty& v) { os << get<N>(v); } };
}

template<typename... Tys> ostream& operator<<(ostream& os, const tuple<Tys...>& t) { os << "["; aux::tp<tuple<Tys...>, 0, sizeof...(Tys) - 1>::print(os, t); os << "]"; return os; }

template<typename A, size_t N, typename T> inline void Fill(A(&array)[N], const T &val) { fill((T*)array, (T*)(array + N), val); }

void dump_func() { DUMPOUT << endl; }
template <class Head, class... Tail> void dump_func(Head&& head, Tail&&... tail) { DUMPOUT << head; if (sizeof...(Tail) == 0) { DUMPOUT << " "; } else { DUMPOUT << ","; } dump_func(move(tail)...); }

#define PI 3.14159265358979323846
#define EPS 1e-8
#define FOR(t,a,n) for(int t=(a);t<(n);++t)
#define REP(t,n)  FOR(t,0,n)
#define all(j) (j).begin(), (j).end()
#define SZ(j) ((int)(j).size())
#define fake false



class Timer {
public:
  double t = 0;
  Timer() {}
  static double time() {
#ifdef _MSC_VER
    return __rdtsc() / 2.8e9;
#else
    unsigned long long a, d;
    __asm__ volatile("rdtsc"
      : "=a"(a), "=d"(d));
    return (d << 32 | a) / 2.8e9;
#endif
  }
  void measure() { t = time() - t; }
  double elapsedMs() { return (time() - t) * 1000.0; }
} timer;

struct Xorshift {
  uint64_t x = 88172645463325252LL;
  unsigned nextUInt() {
    x = x ^ (x << 7);
    return x = x ^ (x >> 9);
  }
  unsigned nextUInt(unsigned mod) {
    x = x ^ (x << 7);
    x = x ^ (x >> 9);
    return x % mod;
  }
  unsigned nextUInt(unsigned l, unsigned r) {
    x = x ^ (x << 7);
    x = x ^ (x >> 9);
    return x % (r - l + 1) + l;
  }
  double nextDouble() {
    return double(nextUInt()) / UINT_MAX;
  }
} rnd;

template<typename T>
void shuffleVector(vector<T>& v, Xorshift& rnd) {
  int n = v.size();
  for (int i = n - 1; i >= 1; i--) {
    int r = rnd.nextUInt(i);
    swap(v[i], v[r]);
  }
}



int main() {
  cin.tie(0);
  ios::sync_with_stdio(false);

  string S, T;
  cin >> S >> T;
  cout << T << S << endl;

  return 0;
}


Measured memory_bytes: 256