T=int(input())
for _ in range(T):
	m=int(input())
	d=[9]+list(map(int,input().split()))
	s=""
	for i in reversed(range(10)):
		s+=str(i)*d[i]
	s=int(s)
	t=(-s)%m
	s+=t if t!=0 else m
	print(s)