#include <bits/stdc++.h>
using namespace std;
void __print(int x) { cerr << x; }
void __print(long x) { cerr << x; }
void __print(long long x) { cerr << x; }
void __print(unsigned x) { cerr << x; }
void __print(unsigned long x) { cerr << x; }
void __print(unsigned long long x) { cerr << x; }
void __print(float x) { cerr << x; }
void __print(double x) { cerr << x; }
void __print(long double x) { cerr << x; }
void __print(char x) { cerr << '\'' << x << '\''; }
void __print(const char *x) { cerr << '\"' << x << '\"'; }
void __print(const string &x) { cerr << '\"' << x << '\"'; }
void __print(bool x) { cerr << (x ? "true" : "false"); }
template <typename T, typename V>
void __print(const pair<T, V> &x) {
  cerr << '{';
  __print(x.first);
  cerr << ',';
  __print(x.second);
  cerr << '}';
}
template <typename T>
void __print(const T &x) {
  int f = 0;
  cerr << '{';
  for (auto &i : x) cerr << (f++ ? "," : ""), __print(i);
  cerr << "}";
}
void _print() { cerr << "]\n"; }
template <typename T, typename... V>
void _print(T t, V... v) {
  __print(t);
  if (sizeof...(v)) cerr << ", ";
  _print(v...);
}
void solve() {
  string s;
  cin >> s;
  int c0 = 0, c1 = 0;
  for (char c : s) {
    c == '0' ? c0++ : c1++;
  }
  if (c0 == 0 || c1 == 0) {
    cout << s;
  } else {
    for (int i = 0; i < s.size(); ++i) {
      if (i % 2 == 0) {
        if (s[i] != '1') s.insert(s.begin() + i, '1');
      } else {
        if (s[i] != '0') s.insert(s.begin() + i, '0');
      }
    }
    cout << s;
  }
  cout << endl;
}
int main() {
  ios_base::sync_with_stdio(0);
  cin.tie(NULL), cout.tie(NULL);
  int tt;
  cin >> tt;
  while (tt--) {
    solve();
  }
  return 0;
}
