#include<stdio.h>
int main(){
    long long t,a[11]={0},i,age,index,min;
    scanf("%lld",&t);
    while(t--){
    	scanf("%lld ",&a[10]);
		for(i=1;i<10;i++)
			scanf("%lld",&a[i]);
		min=a[1];
		index=1;
		for(i=2;i<11;i++){
			if(a[i]<min){
				index=i;
				min=a[i];
			}
		}
        age=0;
		if(index<10){
			for(i=1;i<=min+1;i++){
				age=age*10+index;
			}
		}
		else{
			age=1;
			for(i=1;i<=min+1;i++){
				age=age*10+0;
			}
		}
		printf("%lld\n",age);
	}
	return 0;
}

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

MwoyIDEgMSA0IDAgNiAzIDIgMiAyCjAgMSAxIDEgMSAxIDEgMSAxIDEKMSAyIDIgMiAyIDIgMiAyIDIgMgo=

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