#include <bits/stdc++.h> //Andrei Alexandru a.k.a Sho10
#define ll long long
#define double long double
#pragma GCC optimize("O3")
#pragma GCC optimize("Ofast")
#define all(a) (a).begin(), (a).end()
#define f first
#define s second
#define pb push_back
#define mp make_pair
#define pi pair
#define rc(s) return cout<<s,0
#define endl '\n'
#define mod 1000007
#define PI 3.14159265359
#define MAXN 100005
#define INF 1000000005
#define LINF 1000000000000000005ll
#define CODE_START ios_base::sync_with_stdio(false);cin.tie(0);cout.tie(0);
using namespace std;
ll t,cnt[25],k;
int32_t main(){
CODE_START;
cin>>t;
while(t--){
cin>>k;
for(ll i=1; i<=9; i++){
cin>>cnt[i];
}
ll mx=0;
for(ll i=1;i<=9;i++){
if(cnt[i]>0){mx=i;}
}
string ans="";
ans.pb('0'+mx);
cnt[mx]--;
mx=0;
for(ll i=9; i>=1; i--){
if(cnt[i]>0){
mx=i;
break;
}
}
ll sum=0;
for(ll i=1;i<mx;i++){
if(sum>=cnt[mx]){
break;
}
sum+=cnt[i];
}
if(sum>=cnt[mx]){
for(ll i=1;(i<=mx)&&(cnt[mx]>0);i++){
while((cnt[i]>0)&&(cnt[mx]>0)){
cout<<mx;
cnt[mx]--;
if(cnt[i]>0)
{cout<<i;
cnt[i]--;
}
}
}
}
for(ll i=9;i>=1;i--){
for(ll j=1;j<=cnt[i];j++){
cout<<i;
}
}
cout<<ans<<endl;
}
}
/*
Subtask 2:
1
2
1 1 2 0 0 0 0 0 0
*/
