X = int(input())
if X == 1:
    print(2)
    print(1, 2)
    print("b g")
    exit()

M = 2 * 10 ** 5
L = []
while X % 4 == 0:
    L.append(4)
    X //= 4
for i in range(2, M + 1):
    while X % i == 0:
        L.append(i)
        X //= i

if X != 1:
    print(-1)
    exit()

now = len(L)
GB = ["b"] * now
ans = []
for i in range(now - 1):
    ans.append((i + 1, i + 2))

now += 1
for i in range(len(L)):
    for j in range(L[i]):
        ans.append((i + 1, now))
        now += 1
        GB.append("g")
        
if len(GB) > M:
    print(-1)
    exit()
    
print(len(GB))
for a, b in ans:
    print(a, b)
print(*GB)