T = int(input())

for _ in range(T):
	N = int(input())
	F = input()
	
	ans, k = 0, 0
	for i in range(N):
		if F[i] == "+":
			if k == 0:
				ans += 9
			k = 0
		elif F[i] == "-":
			if k == 0:
				ans += 9
			k = -1
		elif F[i] == "*" or F[i] == "/":
			if k == 0:
				ans += 9
		else:
			if k == 0:
				ans += 9 - int(F[i])
			else:
				ans += int(F[i]) - 1
	print(ans)