import sys
from collections import deque

input = lambda :sys.stdin.readline().rstrip()
mi = lambda :map(int,input().split())
li = lambda :list(mi())

N = int(input())
LCM = {}
all_divisors = set()
A = [1 for i in range(N)]
for i in range(N):
    m = int(input())
    D = [1]
    for _ in range(m):
        p,e = mi()
        t = pow(p,e)
        A[i] *= t
        D = [d for d in D] + [d*t for d in D]
        if p in LCM:
            LCM[p] = max(LCM[p],t)
        else:
            LCM[p] = t
    for d in D:
        all_divisors.add(d)

prime_pow = [LCM[p] for p in LCM]
n = len(prime_pow)

deq = deque([(1,-1)])
prod = -1
while deq:
    v,k = deq.popleft()
    for i in range(k+1,n):
        if v * prime_pow[i] not in all_divisors:
            prod = v * prime_pow[i]
            deq = []
            break
        deq.append((v*prime_pow[i],i))

if prod==-1:
    exit(print(-1))

selected_p = []
for i in range(n):
    if prod%prime_pow[i]==0:
        selected_p.append(prime_pow[i])

k = len(selected_p)
S = [[] for i in range(k)]
for a in A:
    for i in range(k):
        if a%selected_p[i]:
            S[i].append(a)
            break

print(k)
for i in range(k):
    S[i] = [len(S[i])] + S[i]
    print(*S[i])