for _ in range(int(input())):
    n = int(input())
    S = input()
    f = 0
    ans = 0
    for s in S:
        if f:
            if not s in "-*+":
                ans += int(s)-1
        else:
            if s in "-*+":
                ans += 9
            else:
                ans += 9-int(s)
        if s == "+":
            f = 0
        elif s == "-":
            f = 1
    print(ans)