#include <iostream>
using namespace std;
 
int main() {
	// your code goes here
	int t, arr[10], minVal, minVal2, minIndex, minIndex2;
	cin>>t;
	while(t--) {
		minVal=15; minVal2=15; minIndex=-1; minIndex2=-1;
		for(int i=0; i<10; i++) {
			cin>>arr[i]; 
			if(arr[i]<minVal) {
				minVal=arr[i]; minIndex=i;
			}
			else if(arr[i]<minVal2 && i!=0) {
				minVal2=arr[i]; minIndex2=i;
			}
		}
		if(minIndex!=0) for(;minVal>=0; minVal--) cout<<minIndex;
		else if(minVal==minVal2) for(;minVal2>=0; minVal2--) cout<<minIndex2;
		else {
			cout<<1; for(;minVal>=0; minVal--) cout<<minIndex;
		}
		cout<<endl;
	}
	return 0;
}

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NgoyIDEgMSA0IDAgNiAzIDIgMiAyCjAgMSAxIDEgMSAxIDEgMSAxIDEKMiAyIDEgMiAxIDEgMyAxIDEgMQoxIDIgMiAyIDIgMiAyIDIgMiAyCjMgMyAyIDMgMyAyIDMgMyAyIDIKMiAzIDMgMyAyIDMgMyAzIDMgMg==

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