#include <bits/stdc++.h>

using namespace std;

int main()
{
    int t;
    cin >> t;
    while(t--)
    {
        int n;
        cin >> n;
        string a;
        cin >> a;
        int b [n], c [n];
        bool isbigger = 0;
        for (int i = 0; i < n; i++)
        {
            if (a [i] - '0' == 0)
            {
                b [i] = 0;
                c [i] = 0;
            }
            if (a [i] - '0' == 1)
            {
                if (!isbigger)
                {
                    b [i] = 1;
                    c [i] = 0;
                    isbigger = 1;
                }
                else
                {
                    b [i] = 0;
                    c [i] = 1;
                }
            }
            if (a [i] - '0' == 2)
            {
                if (!isbigger)
                {
                    b [i] = 1;
                    c [i] = 1;
                }
                else
                {
                    b [i] = 0;
                    c [i] = 2;
                }
            }
        }
        int i = 0;
        while (b [i] == 0)
            i++;
        if (i == n)
            i--;
        for (i; i < n; i++)
            cout << b [i];
        cout << "\n";
        i = 0;
        while (c [i] == 0)
            i++;
        if (i == n)
            i--;
        for (i; i < n; i++)
            cout << c [i];
        cout << "\n";
    }
}