#include <bits/stdc++.h>
#pragma GCC optimize("O3")
#pragma GCC target("sse4")
using namespace std;
template <typename T>
void etch(T V) {
  for (auto x : V) cout << x << ' ';
  cout << '\n';
}
vector<string> vec_splitter(string s) {
  s += ',';
  vector<string> res;
  while (!s.empty()) {
    res.push_back(s.substr(0, s.find(',')));
    s = s.substr(s.find(',') + 1);
  }
  return res;
}
void debug_out(vector<string> __attribute__((unused)) args,
               __attribute__((unused)) long long int idx,
               __attribute__((unused)) long long int LINE_NUM) {
  cerr << endl;
}
template <typename Head, typename... Tail>
void debug_out(vector<string> args, long long int idx, long long int LINE_NUM,
               Head H, Tail... T) {
  if (idx > 0)
    cerr << ", ";
  else
    cerr << "Line(" << LINE_NUM << ") ";
  stringstream ss;
  ss << H;
  cerr << args[idx] << " = " << ss.str();
  debug_out(args, idx + 1, LINE_NUM, T...);
}
const long long int MOD = 1e9 + 7;
const long long int MOD1 = 998244353;
const long long int N = 2e5 + 5;
const long long int INF = 1000111000111000111LL;
const long double EPS = 1e-12;
const long double PI = 3.141592653589793116;
void impossible() {
  cout << "IMPOSSIBLE";
  exit(0);
}
int32_t main() {
  std::ios_base::sync_with_stdio(0);
  cin.tie(NULL);
  cout.tie(NULL);
  long long int n;
  cin >> n;
  vector<long long int> L(n), R(n);
  for (long long int i = 0; i < n; i++) {
    cin >> L[i] >> R[i];
  }
  string ans = "";
  for (long long int i = n - 1; i >= 0; i--) {
    long long int cntr = 0;
    vector<long long int> possibilities;
    possibilities.push_back(1);
    long long int in_btw = 0;
    for (auto ch : ans) {
      in_btw++;
      if (ch == '(') {
        cntr++;
      } else {
        cntr--;
        if (!cntr) {
          possibilities.push_back(in_btw + 1);
        }
      }
    }
    long long int idx = -1;
    for (auto p : possibilities) {
      if (p >= L[i] && p <= R[i]) {
        idx = p;
        break;
      }
    }
    if (idx == -1) impossible();
    string new_ans = "(" + ans.substr(0, idx - 1) + ")" + ans.substr(idx - 1);
    ans = new_ans;
  }
  cout << ans;
  return 0;
}
