T = int(input())

for i in range(T):

    A,B,C = map(int,input().split())

    if A==B and B==C:

        if A < 3:
            print (-1)
        else:
            print (3)

    elif A==B or B==C:
        if B == 1:
            print (-1)
        elif abs(A-C) == 1: #1 2 2 or 2 2 3
            if min(A,B,C) == 1:
                print (-1)
            elif min(A,B,C) < B:
                print (2)
            else:
                print (1)

        else: #3 9 9
            print (1)
            
    elif A == C:
        if A != 1 and B != A-1:
            print (1)
        elif A != 1 and B == A-1 and A-2 > 0:
            print (2)
        else:
            print (-1)

    else: #9 2 1

        ans = float("inf")

        if min(A,B,C) == B or max(A,B,C) == B:
            print (0)
        else:
            ans = float("inf")

            if A < C:
                t = C
                C = A
                A = t

            na = B-1

            if na != C and na > 0:
                ans = min(ans,A-na)

            nb = C-1
            if nb > 0:
                ans = min(ans,B-nb)

            if ans == float("inf"):
                print (-1)
            else:
                print (ans)