#include<bits/stdc++.h>
using namespace std;
int ar[11];
 
int main()
{
    int t;
    cin>>t;
    while(t--)
    {
        int minn=1000000;
       int pos;
      int zero=0;
      bool check=false;
        int zeropos[11]={0};
       for(int i=0;i<10;i++)
       {
 
 
            cin>>ar[i];
             if(ar[i]==0)
            zeropos[zero++]=i;
       }
       if(ar[0]==0)
        check=true;
       for(int i=1;i<=9;i++)
       {
           if(minn>ar[i])
           {
               minn=ar[i];
               pos=i;
           }
       }
       if(zero==1 && check==true)
       {
           cout<<"10";
       }
       else if(check==false && zero==1)
       {
           cout<<zeropos[0];
       }
       else if(zero>1 && check==true)
       {
           cout<<zeropos[1];
       }
       else if(zero>1 && check==false)
       {
           cout<<zeropos[0];
       }
       else if(zero==0)
       {
           if(ar[0]<minn)
           {
               cout<<pos;
               for(int i=0;i<ar[0]+1;i++)
                cout<<0;
           }
           else
           for(int i=0;i<minn+1;i++)
            cout<<pos;
       }
       else
       {
 
       }
       cout<<endl;
    }
    return 0;
}
 
 

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6
0 0 0 0 0 0 0 0 0 0
1 1 1 1 1 1 1 1 1 1
0 0 1 0 0 1 0 0 0 0
2 3 3 2 3 3 2 4 3 3
2 7 7 7 7 7 7 7 7 3
1 7 1 2 2 2 2 2 2 2