Coloring cube

n = int(input())

elements = ['R', 'G', 'B']

for i in range(n): #box

    for j in range(n): #row

        out = ''
        
        for k in range(n): #column
            counter = 1 * k + (j * -1) + (i * -1)
            out += elements[counter % 3] + ' '

        print(out)

    print()

Test 1

Verdict: ACCEPTED

Test 2

Verdict: ACCEPTED

Test 3

Verdict: ACCEPTED

Test 4

Verdict: ACCEPTED

Test 5

Verdict: ACCEPTED

Test 6

Verdict: ACCEPTED

Test 7

Verdict: ACCEPTED

Test 8

Verdict: ACCEPTED

Test 9

Verdict: ACCEPTED

Test 10

Verdict: ACCEPTED