for _ in range(int(input())):
    n, m = map(int, input().split())
    d = {x : 1 for x in map(int, input().split())}
    for x in map(int, input().split()):
        d[x] = d.get(x, 0) | 2
    v = [[], [], []]
    for x, t in d.items():
        v[t - 1].append(x)
    ans = []
    if not v[2]:
        if v[0] and v[1]:
            print('No')
            continue
        elif v[0]:
            ans = [(0, x) for x in v[0]]
        else:
            ans = [(1, x) for x in v[1]]
    else:
        for x in v[2]:
            if not ans:
                ans.extend((0, x) for x in v[0])
                ans.append((0, x))
                ans.append((1, x))
                ans.extend((1, x) for x in v[1])
            else:
                t = ans[-1][0]
                ans.append((t, x))
                ans.append((t ^ 1, x))
    print('Yes')
    for t, x in ans:
        print(('Red' if t == 0 else 'Blue'), x)