t=int(input())


for _ in range (t):
    n=int(input())
    p = ['R', 'G', 'B']
    for i in range(n):

        if(i%2==0) :
            f=p[1]+p[0]+p[2]
            p=list(f)

        else :
            f=p[0]+p[2]+p[1]
            p=list(f)

    print(f)