#pragma GCC optimize("Ofast")
#pragma GCC optimize("unroll-loops")
#pragma GCC optimize("inline")
#include<bits/stdc++.h>
using namespace std;
template<class T> struct cLtraits_identity{
  using type = T;
}
;
template<class T> using cLtraits_try_make_signed =
  typename conditional<
    is_integral<T>::value,
    make_signed<T>,
    cLtraits_identity<T>
    >::type;
int next_scomb(int len, int arr[], int lim){
  int i;
  for(i=(len)-1;i>=(0);i--){
    if(arr[i] < lim+i-len){
      arr[i]++;
      i++;
      while(i < len){
        arr[i] = arr[i-1] + 1;
        i++;
      }
      return 1;
    }
    arr[i] = 0;
  }
  for(i=(0);i<(len);i++){
    arr[i] = i;
  }
  return 0;
}
inline int my_getchar_unlocked(){
  static char buf[1048576];
  static int s = 1048576;
  static int e = 1048576;
  if(s == e && e == 1048576){
    e = fread_unlocked(buf, 1, 1048576, stdin);
    s = 0;
  }
  if(s == e){
    return EOF;
  }
  return buf[s++];
}
inline void rd(int &x){
  int k;
  int m=0;
  x=0;
  for(;;){
    k = my_getchar_unlocked();
    if(k=='-'){
      m=1;
      break;
    }
    if('0'<=k&&k<='9'){
      x=k-'0';
      break;
    }
  }
  for(;;){
    k = my_getchar_unlocked();
    if(k<'0'||k>'9'){
      break;
    }
    x=x*10+k-'0';
  }
  if(m){
    x=-x;
  }
}
struct MY_WRITER{
  char buf[1048576];
  int s;
  int e;
  MY_WRITER(){
    s = 0;
    e = 1048576;
  }
  ~MY_WRITER(){
    if(s){
      fwrite_unlocked(buf, 1, s, stdout);
    }
  }
}
;
MY_WRITER MY_WRITER_VAR;
void my_putchar_unlocked(int a){
  if(MY_WRITER_VAR.s == MY_WRITER_VAR.e){
    fwrite_unlocked(MY_WRITER_VAR.buf, 1, MY_WRITER_VAR.s, stdout);
    MY_WRITER_VAR.s = 0;
  }
  MY_WRITER_VAR.buf[MY_WRITER_VAR.s++] = a;
}
inline void wt_L(char a){
  my_putchar_unlocked(a);
}
inline void wt_L(int x){
  int s=0;
  int m=0;
  char f[10];
  if(x<0){
    m=1;
    x=-x;
  }
  while(x){
    f[s++]=x%10;
    x/=10;
  }
  if(!s){
    f[s++]=0;
  }
  if(m){
    my_putchar_unlocked('-');
  }
  while(s--){
    my_putchar_unlocked(f[s]+'0');
  }
}
inline void wt_L(unsigned x){
  int s=0;
  char f[10];
  while(x){
    f[s++]=x%10;
    x/=10;
  }
  if(!s){
    f[s++]=0;
  }
  while(s--){
    my_putchar_unlocked(f[s]+'0');
  }
}
inline void wt_L(long long x){
  int s=0;
  int m=0;
  char f[20];
  if(x<0){
    m=1;
    x=-x;
  }
  while(x){
    f[s++]=x%10;
    x/=10;
  }
  if(!s){
    f[s++]=0;
  }
  if(m){
    my_putchar_unlocked('-');
  }
  while(s--){
    my_putchar_unlocked(f[s]+'0');
  }
}
inline void wt_L(unsigned long long x){
  int s=0;
  char f[21];
  while(x){
    f[s++]=x%10;
    x/=10;
  }
  if(!s){
    f[s++]=0;
  }
  while(s--){
    my_putchar_unlocked(f[s]+'0');
  }
}
int WRITER_DOUBLE_DIGIT = 15;
inline int writerDigit_double(){
  return WRITER_DOUBLE_DIGIT;
}
inline void writerDigit_double(int d){
  WRITER_DOUBLE_DIGIT = d;
}
inline void wt_L(double x){
  const int d = WRITER_DOUBLE_DIGIT;
  int k;
  int r;
  double v;
  if(x!=x || (x==x+1 && x==2*x)){
    my_putchar_unlocked('E');
    my_putchar_unlocked('r');
    my_putchar_unlocked('r');
    return;
  }
  if(x < 0){
    my_putchar_unlocked('-');
    x = -x;
  }
  x += 0.5 * pow(0.1, d);
  r = 0;
  v = 1;
  while(x >= 10*v){
    v *= 10;
    r++;
  }
  while(r >= 0){
    r--;
    k = floor(x / v);
    if(k >= 10){
      k = 9;
    }
    if(k <= -1){
      k = 0;
    }
    x -= k * v;
    v *= 0.1;
    my_putchar_unlocked(k + '0');
  }
  if(d > 0){
    my_putchar_unlocked('.');
    v = 1;
    for(r=(0);r<(d);r++){
      v *= 0.1;
      k = floor(x / v);
      if(k >= 10){
        k = 9;
      }
      if(k <= -1){
        k = 0;
      }
      x -= k * v;
      my_putchar_unlocked(k + '0');
    }
  }
}
inline void wt_L(const char c[]){
  int i=0;
  for(i=0;c[i]!='\0';i++){
    my_putchar_unlocked(c[i]);
  }
}
inline void wt_L(string &x){
  int i=0;
  for(i=0;x[i]!='\0';i++){
    my_putchar_unlocked(x[i]);
  }
}
template<class T, class S> inline T pow_L(T a, S b){
  T res = 1;
  res = 1;
  for(;;){
    if(b&1){
      res *= a;
    }
    b >>= 1;
    if(b==0){
      break;
    }
    a *= a;
  }
  return res;
}
inline double pow_L(double a, double b){
  return pow(a,b);
}
template<class T, class U> inline T GCD_L(T a, U b){
  T r;
  while(b){
    r=a;
    a=b;
    b=r%a;
  }
  return a;
}
template<class S, class T> inline S chmax(S &a, T b){
  if(a<b){
    a=b;
  }
  return a;
}
int N;
int A[100000];
set<int> has[100000];
int m[100000];
int p[100000][30];
int e[100000][30];
int arr[100000][30];
int k;
int g;
int tmp;
int ress;
int res[100000];
int ok[100000];
map<int,int> ind;
map<int,int> mx;
int main(){
  int i;
  rd(N);
  for(i=(0);i<(N);i++){
    rd(m[i]);
    {
      int Q5VJL1cS;
      for(Q5VJL1cS=(0);Q5VJL1cS<(m[i]);Q5VJL1cS++){
        rd(p[i][Q5VJL1cS]);
        rd(e[i][Q5VJL1cS]);
      }
    }
  }
  for(i=(0);i<(N);i++){
    int j;
    A[i] = 1;
    for(j=(0);j<(m[i]);j++){
      A[i] *=(pow_L(p[i][j],e[i][j]));
    }
  }
  int t_ynMSdg;
  cLtraits_try_make_signed<remove_reference<decltype((*((int*)NULL)))>::type>::type KrdatlYV;
  if(N==0){
    KrdatlYV = 0;
  }
  else{
    KrdatlYV = A[0];
    for(t_ynMSdg=(1);t_ynMSdg<(N);t_ynMSdg++){
      KrdatlYV = GCD_L(KrdatlYV, A[t_ynMSdg]);
    }
  }
  g =KrdatlYV;
  for(i=(0);i<(N);i++){
    int j;
    for(j=(0);j<(m[i]);j++){
      tmp = g;
      while(tmp % p[i][j] == 0){
        tmp /= p[i][j];
        e[i][j]--;
      }
    }
  }
  for(i=(0);i<(N);i++){
    int j;
    for(j=(0);j<(m[i]);j++){
      if(e[i][j]){
        if(ind.count(p[i][j]) == 0){
          ind[p[i][j]] = k++;
        }
        chmax(mx[p[i][j]], e[i][j]);
      }
    }
  }
  for(i=(0);i<(N);i++){
    int j;
    for(j=(0);j<(m[i]);j++){
      if(e[i][j] && mx[p[i][j]] == e[i][j]){
        has[i].insert(ind[p[i][j]]);
      }
    }
  }
  for(i=(0);i<(N);i++){
    if(has[i].size() == k){
      wt_L(-1);
      wt_L('\n');
      return 0;
    }
  }
  for(int s=2;;s++){
    int d[s];
    {
      if(k >= s){
        int zT28qSmp;
        for(zT28qSmp=(0);zT28qSmp<(s);zT28qSmp++){
          d[zT28qSmp] = zT28qSmp;
        }
        do{
          {
            int j;
            for(i=(0);i<(N);i++){
              int j;
              for(j=(0);j<(s);j++){
                if(has[i].count(d[j]) == 0){
                  break;
                }
              }
              if(j == s){
                goto szDqbNYU;
              }
            }
            wt_L(s);
            wt_L('\n');
            for(j=(0);j<(s);j++){
              ress = 0;
              for(i=(0);i<(N);i++){
                if(!ok[i] && has[i].count(d[j])==0){
                  res[ress++] = A[i];
                  ok[i] = 1;
                }
              }
              wt_L(ress);
              wt_L(' ');
              {
                int HOAyP4rA;
                if(ress==0){
                  wt_L('\n');
                }
                else{
                  for(HOAyP4rA=(0);HOAyP4rA<(ress-1);HOAyP4rA++){
                    wt_L(res[HOAyP4rA]);
                    wt_L(' ');
                  }
                  wt_L(res[HOAyP4rA]);
                  wt_L('\n');
                }
              }
            }
            return 0;
          }
          szDqbNYU:;
        }
        while(next_scomb(s,d,k));
      }
    }
  }
  return 0;
}
// cLay version 20210926-1

// --- original code ---
// int N, A[1d5]; set<int> has[];
// int m[1d5], p[1d5][30], e[1d5][30], arr[1d5][30], k, g, tmp;
// int ress, res[1d5], ok[];
// map<int,int> ind, mx;
// {
//   rd(N);
//   rep(i,N) rd(m[i],(p[i],e[i])(m[i]));
//   rep(i,N){
//     A[i] = 1;
//     rep(j,m[i]) A[i] *= p[i][j]**e[i][j];
//   }
//   g = gcd(A(N));
//   rep(i,N) rep(j,m[i]){
//     tmp = g;
//     while(tmp % p[i][j] == 0) tmp /= p[i][j], e[i][j]--;
//   }
//   rep(i,N) rep(j,m[i]) if(e[i][j]){
//     if(ind.count(p[i][j]) == 0) ind[p[i][j]] = k++;
//     mx[p[i][j]] >?= e[i][j];
//   }
//   rep(i,N) rep(j,m[i]) if(e[i][j] && mx[p[i][j]] == e[i][j]) has[i].insert(ind[p[i][j]]);
//   rep(i,N) if(has[i].size() == k) wt(-1), return 0;
// 
//   for(int s=2;;s++){
//     int d[s];
//     rep_scomb(d,s,k){
//       rep(i,N){
//         rep(j,s) if(has[i].count(d[j]) == 0) break;
//         if(j == s) break_continue;
//       }
//       wt(s);
//       rep(j,s){
//         ress = 0;
//         rep(i,N) if(!ok[i] && has[i].count(d[j])==0) res[ress++] = A[i], ok[i] = 1;
//         wt(ress, res(ress));
//       }
//       return 0;
//     }
//   }
// }