T = int(input())
for _ in range(T):
    N, M = map(int, input().split())
    A = list(map(int, input().split()))
    B = list(map(int, input().split()))
    if N>0 and M>0:
        setA = set(A)
        setB = set(B)
        same = []
        diff = []
        for b in B:
            if b in setA:
                same.append(b)
            else:
                diff.append(b)
        if len(same)==0:
            print("No")
            continue

        print("Yes")
        for d in diff:
            print("Blue", d)
        for i, s in enumerate(same):
            if i%2==0:
                print("Blue", s)
                print("Red", s)
                if i==0:
                    for a in setA:
                        if a not in setB:
                            print("Red", a)
            else:
                print("Red", s)
                print("Blue", s)

    elif N>0:
        print("Yes")
        for a in A:
            print("Red", a)
    else:
        print("Yes")
        for b in B:
            print("Blue", b)