#include <bits/stdc++.h>
using namespace std;
const long long mod = 1e9 + 7;
long long power(long long x, long long y, long long p) {
  long long res = 1;
  x = x % p;
  while (y > 0) {
    if (y & 1) res = (res * x) % p;
    y = y >> 1;
    x = (x * x) % p;
  }
  return res;
}
template <typename Arg1>
void __f(const char* name, Arg1&& arg1) {
  cerr << name << " = " << arg1 << '\n';
}
template <typename Arg1, typename... Args>
void __f(const char* names, Arg1&& arg1, Args&&... args) {
  const char* comma = strchr(names + 1, ',');
  cerr.write(names, comma - names) << " = " << arg1 << " || ";
  __f(comma + 1, args...);
}
template <class Ch, class Tr, class Container>
basic_ostream<Ch, Tr>& operator<<(basic_ostream<Ch, Tr>& os,
                                  Container const& x) {
  os << "{ ";
  for (auto& y : x) os << y << " ; ";
  return os << "}";
}
template <class X, class Y>
ostream& operator<<(ostream& os, pair<X, Y> const& p) {
  return os << "[ " << p.first << ", " << p.second << "]";
}
const long long L = 5e5 + 5;
long long lps[L];
void compute(string s) {
  long long n = (long long)(s.size());
  lps[0] = 0;
  for (long long i = 1; i < n; i++) {
    long long j = lps[i - 1];
    while (j > 0 && s[i] != s[j]) j = lps[j - 1];
    if (s[i] == s[j]) j++;
    lps[i] = j;
  }
}
int main() {
  ios_base::sync_with_stdio(false);
  cin.tie(NULL);
  cout.tie(NULL);
  string s, t;
  cin >> s >> t;
  compute(t);
  long long rep = lps[(long long)(t.size()) - 1];
  pair<long long, long long> c1 = {0, 0};
  pair<long long, long long> c2 = {0, 0};
  for (long long i = 0; i < (long long)(s.size()); i++) {
    if (s[i] == '0')
      c1.first++;
    else
      c1.second++;
  }
  for (long long i = 0; i < (long long)(t.size()); i++) {
    if (t[i] == '0')
      c2.first++;
    else
      c2.second++;
  }
  if (c2.first > c1.first || c2.second > c1.second) {
    cout << s << '\n';
  } else {
    cout << t;
    pair<long long, long long> temp = {0, 0};
    string repstring = "";
    for (long long i = rep; i < (long long)(t.size()); i++) {
      repstring += t[i];
      if (t[i] == '0')
        temp.first++;
      else
        temp.second++;
    }
    c1.first -= c2.first;
    c1.second -= c2.second;
    while (1) {
      if (c1.first >= temp.first && c1.second >= temp.second) {
        c1.first -= temp.first;
        c1.second -= temp.second;
        cout << repstring;
      } else
        break;
    }
    for (long long i = 0; i < c1.first; i++) cout << 0;
    for (long long i = 0; i < c1.second; i++) cout << 1;
    cout << '\n';
  }
  return 0;
}
