#include <bits/stdc++.h>
using namespace std;
const int N = 10;
const int inf = 2000000000;
int f(int first, int second, int t[N]) {
  int a[N], b[N];
  for (int i = 0; i < N; i++) {
    a[i] = b[i] = t[i];
  }
  a[first]--;
  b[second]--;
  if (a[first] < 0 || b[second] < 0) {
    return -1;
  }
  if ((first + second) != 10) {
    return 0;
  }
  int cur = 1;
  for (int i = 0; i < N; i++) {
    cur += min(a[i], b[N - i - 1]);
  }
  return cur;
}
pair<string, string> get(int a[N], pair<pair<int, int>, int> code) {
  int q[N], w[N];
  for (int i = 0; i < N; i++) {
    q[i] = w[i] = a[i];
  }
  string s, t;
  for (int i = 0; i < code.second; i++) {
    s += "0";
    t += "0";
    q[0]--;
    w[0]--;
  }
  int first = code.first.first;
  int second = code.first.second;
  s += char(first + '0');
  t += char(second + '0');
  q[first]--;
  w[second]--;
  for (int i = 0; i < N; i++) {
    int val = min(q[i], w[N - i - 1]);
    for (int j = 0; j < val; j++) {
      s += char(i + '0');
      t += char(N - i - 1 + '0');
    }
    q[i] -= val;
    w[N - i - 1] -= val;
  }
  for (int i = 0; i < N; i++) {
    for (int j = 0; j < q[i]; j++) {
      s += char(i + '0');
    }
    for (int j = 0; j < w[i]; j++) {
      t += char(i + '0');
    }
  }
  reverse((s).begin(), (s).end());
  reverse((t).begin(), (t).end());
  return {s, t};
}
int main() {
  cin.tie(0);
  ios_base::sync_with_stdio(0);
  string s;
  cin >> s;
  int a[N];
  memset(a, 0, sizeof(a));
  int n = s.length();
  for (int i = 0; i < n; i++) {
    a[s[i] - '0']++;
  }
  int best = -1;
  pair<pair<int, int>, int> code;
  for (int i = 0; i <= a[0]; i++) {
    int b[N];
    for (int j = 0; j < N; j++) {
      b[j] = a[j];
    }
    b[0] -= i;
    for (int first = 0; first < N; first++) {
      for (int second = 0; second < N; second++) {
        int cur = f(first, second, b);
        if (cur + i > best) {
          best = cur + i;
          code = {{first, second}, i};
        }
      }
    }
  }
  pair<string, string> ans = get(a, code);
  cout << ans.first << "\n" << ans.second;
}
