x = int(input())
if x == 1:
    print(2)
    print(1,2)
    print('b g')
    exit()
a = []
z = 0
for i in range(2,2*10**5):
    while x % i == 0:
        if i == 2:
            z += 1
        else:
            a.append(i)
        x //= i

if x != 1:
    exit(print(-1))
ans = 0

while z >= 2:
    a.append(4)
    z -= 2
if z == 1:
    a.append(2)
ans = sum(a) + len(a)
if ans > 2*10**5:
    exit(print(-1))
x = len(a)
print(ans)
cnt = len(a)
for i in range(len(a)):
    for j in range(a[i]):
        print(i+1,cnt+1)
        cnt +=1 
for i in range(len(a)):
    print('b',end=' ')
for i in range(sum(a)):
    print('g',end=' ')
print()