l = "RGB"
t = int(input())
for i in range(t):
    k = int(input())
    d = {1: "GRB", 2: "GBR"}
    if k % 2 == 0:
        for z in range(k):
            l = l[-1] + l[:-1]       
    else:
        j = (2 * (int(k / 2)))
        for a in range(j):
            l = l[-1] + l[:-1]       
        l = l[-1] + l[:-1] 
    print(d.get(k, l)) 
    l = "RGB"