def solve():
    N = int(input())
    F = input()

    is_plus = True
    ans = 0

    for f in F:
        if f == "+":
            ans += 9 if is_plus else 0
            is_plus = True
        elif f == "-":
            ans += 9 if is_plus else 0
            is_plus = False
        elif f == "*":
            ans += 9 if is_plus else 0
        else:
            num = int(f)
            ans += 9 - num if is_plus else num - 1

    print(ans)


if __name__ == "__main__":
    T = int(input())
    for _ in range(T):
        solve()