C_Given_Length_and_Sum_of_Digits.cpp

#include <bits/stdc++.h>
using namespace std;

#define int long long
using pii = pair<int, int>;

#define forr(i, n) for (int i = 0; i < n; i++)
#define reforr(i, n) for (int i = n; i >= 0; i--)
#define eqforr(i, a, n) for (int i = a; i <= n; i++)
#define sqforr(i, n) for (int i = 1; i * i <= n; i++)
#define genforr(i, a, b) for (int i = a; i < b; i++)
#define pba push_back
#define popb pop_back
#define popf pop_front
#define allEle(x) (x).begin(), (x).end()
#define allRle(x) (x).rbegin(), (x).rend()

typedef vector<int> vint;
typedef vector<string> vstr;
#define vcstr(vstr, n) forr(i, n) cin >> vstr[i]
#define vcin(vint, n) forr(i, n) cin >> vint[i]
#define vpin(vint) for (auto x : vint) cout << x << " "; cout << endl;
#define vpstr(vstr) for (auto x : vstr) cout << x << " "; cout << endl;

void __print(int x) { cerr << x; }
void __print(unsigned x) { cerr << x; }
void __print(unsigned int 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...);
}
#ifndef ONLINE_JUDGE
#define debug(x...) cerr << "[" << #x << "] = [", _print(x)
#else
#define debug(x...)
#endif

const int inf = 1e9 + 5;

int binpow(int a, int b) {
  int res = 1;
  while (b > 0) {
    if (b & 1)
      res = res * a;
    a = a * a;
    b >>= 1;
  }
  return res;
}

void solve() {
  int n, sum;
  cin >> n >> sum;
  if (sum == 0) {
    if (n == 1) {
      cout << "0 0" << endl;
    } else {
      cout << "-1 -1" << endl;
    }
    return;
  }
  int sum1 = sum;
  int sum2 = sum;
  string minn = "", maxx = "";
  for (int i = 0; i < n; i++) {
    for (int j = 0; j < 10; j++) {
      if (i == 0 && j == 0) continue;
      if ((sum1 - j) <= (n - i - 1) * 9) {
        minn += (char)('0' + j);
        sum1 -= j;
        // debug(minn);
        break;
      }
    }
  }
  // cout << minn << " ";
  for (int i = 0; i < n; i++) {
    if (sum <= 9) {
      maxx += (char)('0' + sum);
      sum = 0;
    } else {
      maxx += (char)('0' + 9);
      sum -= 9;
    }
  }
  // cout << sum << endl;
  // cout << 9 * n << endl;
  if (sum2 > 9 * n) {
    cout << "-1 -1" << endl;
  } else {
    cout << minn << " " << maxx << endl;
  }
}

signed main() {
  ios::sync_with_stdio(0);
  cin.tie(0);
  int t = 1;
  // cin >> t;
  for (int i = 0; i < t; i++)
    solve();
}