from collections import defaultdict


def factorint(n):
    factor = defaultdict(int)
    for p in range(2, min(n, 2 * 10**5) + 1):
        while n % p == 0:
            factor[p] += 1
            n //= p
    
    if n == 1:
        return factor
    else:
        print(-1)
        exit()


N = int(input())

if N == 1:
    print(2)
    print(1, 2)
    print("g", "b")
    exit()

factor = factorint(N)
factor[4] = factor[2] // 2
factor[2] %= 2

green = []
brown = []
edges = []

cnt = 0
def add_cnt():
    global cnt
    cnt += 1
    if cnt >= 2 * 10**5:
        print(-1)
        exit()

for p, x in factor.items():
    for _ in range(x):
        if cnt > 0:
            edges.append((brown[-1], cnt))
            
        brown.append(cnt)
        add_cnt()
        
        for _ in range(p):
            green.append(cnt)
            edges.append((brown[-1], cnt))
            add_cnt()

assert len(edges) + 1 < 2 * 10**5
print(len(edges) + 1)

for u, v in edges:
    print(u + 1, v + 1)

colors = [None] * (len(edges) + 1)
for g in green:
    colors[g] = "g"
for b in brown:
    colors[b] = "b"

print(*colors)