def factorization(n):
    arr = []
    temp = n
    for i in range(2, int(-(-n**0.5//1))+1):
        if i>2*10**5:
            break
        if temp%i==0:
            cnt=0
            while temp%i==0:
                cnt+=1
                temp //= i
            arr.append([i, cnt])

    if temp!=1:
        arr.append([temp, 1])

    if arr==[]:
        arr.append([n, 1])

    return arr

import sys
input = sys.stdin.readline
X = int(input())
F = factorization(X)
cnt = 0
for p, e in F:
    cnt += (p+1)*e
if cnt>2*10**5:
    print(-1)
    exit()
uv = []
c = []
i = 0
j = -1
for p, e in F:
    if p==2:
        for _ in range(e//2):
            if j>=0:
                uv.append([i+1, j+1])
                i = j
            c.append("b")
            j = i+1
            for _ in range(4):
                uv.append([i+1, j+1])
                c.append("g")
                j+=1
        if e%2==1:
            if j>=0:
                uv.append([i+1, j+1])
                i = j
            c.append("b")
            j = i+1
            for _ in range(2):
                uv.append([i+1, j+1])
                c.append("g")
                j+=1
    else:
        for _ in range(e):
            if j>=0:
                uv.append([i+1, j+1])
                i = j
            c.append("b")
            j = i+1
            for _ in range(p):
                uv.append([i+1, j+1])
                c.append("g")
                j+=1
n = j
print(n)
for u, v in uv:
    print(u, v)
print(*c)