import java.io.IOException;
import java.io.InputStream;
import java.io.PrintWriter;
import java.util.ArrayDeque;
import java.util.ArrayList;
import java.util.HashSet;
import java.util.List;
import java.util.NoSuchElementException;
import java.util.Queue;
import java.util.Set;

public class Main {
	public static void main(String[] args) {
		//Scanner scanner = new Scanner(System.in);
		FastScanner scanner=new FastScanner();
		PrintWriter out = new PrintWriter(System.out);
		int n=scanner.nextInt();
		int[][] fp=new int[n][];
		int[][] fe=new int[n][];
		int[] a=new int[n];
		int[] mx=new int[1000010];
		int[] q=new int[1000010];
		List<Integer> ql=new ArrayList<>();
		for(int i=0; i<n; i++) {
			int m=scanner.nextInt();
			fp[i]=new int[m];
			fe[i]=new int[m];
			a[i]=1;
			for(int j=0; j<m; j++) {
			    int p=scanner.nextInt();
			    int e=scanner.nextInt();
				fp[i][j]=p;
				fe[i][j]=e;
				if(mx[p]<e) {
					mx[p]=e;
				}
				for(int k=0; k<e; k++) {
					a[i]*=p;
				}
			}
		}
		for(int i=2; i<1000000; i++) {
			if(mx[i]==0)continue;
			q[i]=1;
			for(int j=0; j<mx[i]; j++) {
				q[i]*=i;
			}
			ql.add(q[i]);
		}
		for(int i=0; i<n; i++) {
		    int m=fe[i].length;
			if(m<ql.size())continue;
			boolean ok=true;
			for(int j=0; j<m; j++) {
				int p=fp[i][j], e=fe[i][j];
				if(mx[p]!=e) {
					ok=false;
					break;
				}
			}
			if(ok) {
				out.println(-1);
				out.close();
				return;
			}
		}
		Set<Integer> st=new HashSet<>();
		for(int i=0; i<n; i++) {
			int m=fp[i].length;
			for(int j=0; j<(1<<m); j++) {
				int b=1, c=0;
				for(int k=0; k<m; k++) {
				    if((j&(1<<k))!=0){
    					int p=fp[i][k];
    					if(mx[p]!=fe[i][k]) {
    						c=0;
    						break;
    					}
					    b*=q[p];
					    c++;
				    }
				}
				if(c>1) st.add(b);
			}
		}
		Queue<Integer> que=new ArrayDeque<Integer>();
		Queue<Integer> quei=new ArrayDeque<Integer>();
		for(int i=0; i<ql.size(); i++) {
			que.add(ql.get(i));
			quei.add(i);
		}
		while(!que.isEmpty()) {
			int x=que.poll();
			int i=quei.poll();
			for(int j=i+1; j<ql.size(); j++) {
				long x1=(long)x*ql.get(j);
				if(x1>1000000000 || !st.contains((int)x1)) {
					int c=0;
					for(int v:ql) {
						if(x1%v==0)c++;
					}
					out.println(c);
					boolean[] used=new boolean[n];
					for(int v:ql) {
						if(x1%v!=0)continue;
						List<Integer> w=new ArrayList<>();
						for(int k=0; k<n; k++) {
							if(used[k]) continue;
							if(a[k]%v!=0) {
								w.add(k);
								used[k]=true;
							}
						}
						out.print(w.size());
						for(int k:w) {
							out.print(" "+a[k]);
						}
						out.println();
					}
					out.close();
					return;
				}
				que.add((int)x1);
				quei.add(j);
			}
		}
	}
}
class FastScanner {
	private final InputStream in = System.in;
	private final byte[] buffer = new byte[1024];
	private int ptr = 0;
	private int buflen = 0;

	private boolean hasNextByte() {
		if (ptr < buflen) {
			return true;
		} else {
			ptr = 0;
			try {
				buflen = in.read(buffer);
			} catch (IOException e) {
				e.printStackTrace();
			}
			if (buflen <= 0) {
				return false;
			}
		}
		return true;
	}

	private int readByte() {
		if (hasNextByte())
			return buffer[ptr++];
		else
			return -1;
	}

	private static boolean isPrintableChar(int c) {
		return 33 <= c && c <= 126;
	}

	public boolean hasNext() {
		while (hasNextByte() && !isPrintableChar(buffer[ptr]))
			ptr++;
		return hasNextByte();
	}

	public String next() {
		if (!hasNext())
			throw new NoSuchElementException();
		StringBuilder sb = new StringBuilder();
		int b = readByte();
		while (isPrintableChar(b)) {
			sb.appendCodePoint(b);
			b = readByte();
		}
		return sb.toString();
	}

	public long nextLong() {
		if (!hasNext())
			throw new NoSuchElementException();
		long n = 0;
		boolean minus = false;
		int b = readByte();
		if (b == '-') {
			minus = true;
			b = readByte();
		}
		if (b < '0' || '9' < b) {
			throw new NumberFormatException();
		}
		while (true) {
			if ('0' <= b && b <= '9') {
				n *= 10;
				n += b - '0';
			} else if (b == -1 || !isPrintableChar(b)) {
				return minus ? -n : n;
			} else {
				throw new NumberFormatException();
			}
			b = readByte();
		}
	}

	public int nextInt() {
		long nl = nextLong();
		if (nl < Integer.MIN_VALUE || nl > Integer.MAX_VALUE)
			throw new NumberFormatException();
		return (int) nl;
	}

	public double nextDouble() {
		return Double.parseDouble(next());
	}
}