#include <iostream>
#include <vector>
#include <string>
#include <algorithm>
using namespace std;
int main(int argc, char const *argv[])
{
ios_base::sync_with_stdio(0);
cin.tie(0);
int t;
cin >> t;
while (t--) {
int K;
cin >> K;
vector<pair<string, int>> vec(9);
for (int i = 0; i < 9; ++i) {
cin >> vec[i].second;
vec[i].first = '1' + i;
}
string suffix = "";
while ((int) suffix.size() < K - 1) {
if (vec.back().second > K - 1 - (int) suffix.size()) {
vec.back().second -= K - 1 - (int) suffix.size();
suffix = string(K - 1 - (int) suffix.size(), vec.back().first[0]) + suffix;
} else {
suffix = string(vec.back().second, vec.back().first[0]) + suffix;
vec.pop_back();
}
}
while (vec.back().second == 0) vec.pop_back();
for (int i = 0; i < (int) vec.size() - 1; ++i) {
if (vec[i].second == 0) continue;
if (vec[i].second < vec.back().second) {
auto last = vec.back();
vec.back().first += vec[i].first;
vec.back().second = vec[i].second;
vec.push_back(last);
vec.back().second -= vec[i].second;
} else {
vec.back().first += vec[i].first;
vec[i].second -= vec.back().second;
if (vec[i].second > 0) --i;
}
}
for (int i = 0; i < (int) vec.back().second; ++i) {
cout << vec.back().first;
}
cout << suffix << '\n';
}
}
