def check(X):
    flag = True
    for i in range(1,len(X)):
        if X[i] > 0:
            flag = False
    return flag

T = int(input())
for tt in range(T):
    m = int(input())
    D = list(map(int,input().split()))

    D.insert(0,-1)

    ansl = []

    bai = 1
    while check(D) == False:
        tmp = str(bai*m)

        flag = False
        for i in range(1,10):

            if D[i] > 0:
                if tmp.count(str(i)) != 0:

                    while D[i] > 0:

                        for k in range(1,len(D)):
                            D[k] -= tmp.count(str(i))
                        ansl.append(tmp)
            
        # if flag:
        #     ansl.append(tmp)

        bai += 1
    
    print(*ansl,sep="")