l="RGB"
t=int(input())
if 1<=t<=1000:
    for i in range(t):
        k=int(input())
        if 1<=k<=10**7:
            if k==1:
                print("GRB")
            elif k==2:
                print("GBR")

            elif k%2==0:
                for z in range(k):
                    l = l[1] + l[0] + l[2]
                    l = l[::-1]
                print(l)
            elif k%2 != 0:
                j=(2*(int(k/2)))
                for a in range(j):
                    l = l[1] + l[0] + l[2]
                    l = l[::-1]
                l = l[1] + l[0] + l[2]
                print(l)