l="RGB"
t=int(input())
for i in range(t):
    k=int(input())
    if k==1:
        print("GRB")
    elif k == 2:
        print("GBR")
    elif k % 2 == 0:
        for z in range(k):
            l = l[-1] + l[:-1]
        print(l)
        l="RGB"

    else:
        j = (2 * (int(k / 2)))
        for a in range(j):
            l = l[-1] + l[:-1]
        l = l[1] + l[0] + l[2]
        print(l)
        l = "RGB"