Problem: Once Bob saw a string. It contained so many different letters, that the letters were marked by numbers, but at the same time each letter could be met in the string at most 10 times. Bob didn't like that string, because it contained repeats: a repeat of length x is such a substring of length 2x, that its first half coincides character by character with its second half. Bob started deleting all the repeats from the string. He does it as follows: while it's possible, Bob takes the shortest repeat, if it is not unique, he takes the leftmost one, and deletes its left half and everything that is to the left of this repeat.

You're given the string seen by Bob. Find out, what it will look like after Bob deletes all the repeats in the way described above.

Input

The first input line contains integer n (1 ≤ n ≤ 105) — length of the string. The following line contains n space-separated integer numbers from 0 to 109 inclusive — numbers that stand for the letters of the string. It's guaranteed that each letter can be met in the string at most 10 times.

Output

In the first line output the length of the string's part, left after Bob's deletions. In the second line output all the letters (separated by a space) of the string, left after Bob deleted all the repeats in the described way.

Examples

Input

6
1 2 3 1 2 3


Output

3
1 2 3 


Input

7
4 5 6 5 6 7 7


Output

1
7 

Solution (in JAVA):

Solution:
import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collections;
import java.util.StringTokenizer;
import java.util.TreeMap;
import java.util.TreeSet;

public class CodeC 
{
	static class Scanner
	{
		BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
		StringTokenizer st = new StringTokenizer("");
		
		public String nextLine()
		{
			try
			{
				return br.readLine();
			}
			catch(Exception e)
			{
				throw(new RuntimeException());
			}
		}
		
		public String next()
		{
			while(!st.hasMoreTokens())
			{
				String l = nextLine();
				if(l == null)
					return null;
				st = new StringTokenizer(l);
			}
			return st.nextToken();
		}
		
		public int nextInt()
		{
			return Integer.parseInt(next());
		}
		
		public long nextLong()
		{
			return Long.parseLong(next());
		}
		
		public double nextDouble()
		{
			return Double.parseDouble(next());
		}
		
		public int[] nextIntArray(int n)
		{
			int[] res = new int[n];
			for(int i = 0; i < res.length; i++)
				res[i] = nextInt();
			return res;
		}
		
		public long[] nextLongArray(int n)
		{
			long[] res = new long[n];
			for(int i = 0; i < res.length; i++)
				res[i] = nextLong();
			return res;
		}
		
		public double[] nextDoubleArray(int n)
		{
			double[] res = new double[n];
			for(int i = 0; i < res.length; i++)
				res[i] = nextLong();
			return res;
		}
		public void sortIntArray(int[] array)
		{
			Integer[] vals = new Integer[array.length];
			for(int i = 0; i < array.length; i++)
				vals[i] = array[i];
			Arrays.sort(vals);
			for(int i = 0; i < array.length; i++)
				array[i] = vals[i];
		}
		
		public void sortLongArray(long[] array)
		{
			Long[] vals = new Long[array.length];
			for(int i = 0; i < array.length; i++)
				vals[i] = array[i];
			Arrays.sort(vals);
			for(int i = 0; i < array.length; i++)
				array[i] = vals[i];
		}
		
		public void sortDoubleArray(double[] array)
		{
			Double[] vals = new Double[array.length];
			for(int i = 0; i < array.length; i++)
				vals[i] = array[i];
			Arrays.sort(vals);
			for(int i = 0; i < array.length; i++)
				array[i] = vals[i];
		}

		public String[] nextStringArray(int n) 
		{	
			String[] vals = new String[n];
			for(int i = 0; i < n; i++)
				vals[i] = next();
			return vals;
		}
	}
	
	static class Pair implements Comparable <Pair>
	{
		int a;
		int b;
		int tam;
		public Pair(int aa, int bb)
		{
			a = aa;
			b = bb;
			tam = b - a;
		}
		@Override
		public int compareTo(Pair o)
		{
			if(tam == o.tam)
				return a - o.a;
			return tam - o.tam;
		}
	}
	
	static boolean leq(int a1, int a2,   int b1, int b2) 
	{
		return(a1 < b1 || a1 == b1 && a2 <= b2);
	}             

	static boolean leq(int a1, int a2, int a3,   int b1, int b2, int b3) 
	{
		return(a1 < b1 || a1 == b1 && leq(a2,a3, b2,b3));
	}

	static int[] c;

	static void radixPass(int[] a, int[] b, int[] r, int n, int K, int delta)
	{
		if(c == null || c.length != K + 1) c = new int[K + 1];
		for(int i = 0;  i <= K; i++) c[i] = 0;
		for(int i = 0;  i < n;  i++) c[r[a[i] + delta]]++;
		for(int i = 0, sum = 0;  i <= K;  i++) 
		{
			int t = c[i];
			c[i] = sum;
			sum += t;
		}
		for (int i = 0;  i < n;  i++) b[c[r[a[i] + delta]]++] = a[i];
	}

	// find the suffix array SA of s[0..n-1] in {1..K}^n
	// require s[n]=s[n+1]=s[n+2]=0, n>=2
	static void suffixArray(int[] s, int[] SA, int n, int K) 
	{
		int n0=(n+2)/3, n1=(n+1)/3, n2=n/3, n02=n0+n2;
		int[] s12  = new int[n02 + 3];  s12[n02] = s12[n02+1] = s12[n02+2] = 0;
		int[] SA12 = new int[n02 + 3]; SA12[n02]=SA12[n02+1]=SA12[n02+2]=0;
		int[] s0   = new int[n0];
		int[] SA0  = new int[n0];
		for (int i=0, j=0; i < n + (n0 - n1); i++) if (i % 3 != 0) s12[j++] = i;
		radixPass(s12, SA12, s, n02, K, 2);
		radixPass(SA12, s12 , s, n02, K, 1);
		radixPass(s12, SA12, s, n02, K, 0);
		int name = 0, c0 = -1, c1 = -1, c2 = -1;
		for(int i = 0; i < n02; i++) 
		{
			if(s[SA12[i]] != c0 || s[SA12[i] + 1] != c1 || s[SA12[i] + 2] != c2) 
			{
				name++;
				c0 = s[SA12[i]];
				c1 = s[SA12[i] + 1];
				c2 = s[SA12[i] + 2];
			}
			if(SA12[i] % 3 == 1) s12[SA12[i] / 3] = name;
			else s12[SA12[i] / 3 + n0] = name;
		}
		if (name < n02) 
		{
			suffixArray(s12, SA12, n02, name);
			for (int i = 0; i < n02; i++) s12[SA12[i]] = i + 1;
		} 
		else for(int i = 0; i < n02; i++) SA12[s12[i] - 1] = i;
		for (int i = 0, j = 0; i < n02; i++) if (SA12[i] < n0) s0[j++] = 3 * SA12[i];
		radixPass(s0, SA0, s, n0, K, 0);
		for(int p = 0,  t = n0 - n1,  k = 0;  k < n;  k++) 
		{
			int i = (SA12[t] < n0 ? SA12[t] * 3 + 1 : (SA12[t] - n0) * 3 + 2);
			int j = SA0[p];
			if (SA12[t] < n0 ? leq(s[i], s12[SA12[t] + n0], s[j], s12[j/3]) :
				leq(s[i],s[i+1],s12[SA12[t]-n0+1], s[j],s[j+1],s12[j/3+n0]))
			{
				SA[k] = i;
				t++;
				if (t == n02) for(k++; p < n0; p++, k++) SA[k] = SA0[p]; 
			} 
			else 
			{
				SA[k] = j;
				p++;
				if(p == n0) for(k++; t < n02; t++, k++) SA[k] = (SA12[t] < n0 ? SA12[t] * 3 + 1 : (SA12[t] - n0) * 3 + 2); 
			}
		}
	}
	
	static class SuffixArray
	{
		int n;
		int[] g, b, sa, lcp, rmq, aux;
		int[] t;

		SuffixArray(int[] entrada)
		{
			int tamMax = entrada.length;
			g = new int[tamMax];
			b = new int[tamMax];
			sa = new int[tamMax];
			lcp = new int[tamMax];
			aux = new int[tamMax + 3];
			int logn = 1;
			int n = tamMax;
			buildSA(entrada);
		}

		void buildSA(int[] sas)
		{
			n = sas.length;
			t = sas.clone();
			for(int i = 0; i < n; i++)
				aux[i] = t[i];
			aux[n] = aux[n + 1] = aux[n + 2] = 0;
			suffixArray(aux, sa, n, 100010);
			if(n == 1)
				sa[0] = 0;
			if(n != 1)
				buildLCP();
			else
				lcp = new int[1];
		}

		void buildLCP()
		{
			int[] a = sa;
			int h = 0;
			for(int i = 0; i < n; i++) b[a[i]] = i;
			for(int i = 0; i < n; i++) 
			{
				if (b[i] != 0)
				{
					for(int j = a[b[i] - 1]; j + h < n && i + h < n && t[j + h] == t[i + h]; ++h);
					lcp[b[i]] = h;
				} 
				else lcp[b[i]] = -1;
				if(h > 0) --h;
			}
		}
		
		ArrayList <Pair> darRepeats()
		{
			int actual = 0;
			ArrayList <Pair> respuestas = new ArrayList <Pair> ();
			while(actual < n)
			{
				int fin = actual;
				while(fin < n && t[sa[fin]] == t[sa[actual]])
					fin++;
				for(int este = actual; este < fin; este++)
				{
					int min = Integer.MAX_VALUE;
					for(int otro = este + 1; otro < fin; otro++)
					{
						min = Math.min(min, lcp[otro]);
						if(min >= Math.abs(sa[este] - sa[otro]))
							respuestas.add(new Pair(Math.min(sa[este], sa[otro]), Math.max(sa[este], sa[otro])));
					}
				}
				actual = fin;
			}
			return respuestas;
		}
	}
	
	public static void main(String[] args)
	{
		Scanner sc = new Scanner();
		int n = sc.nextInt();
		int[] entrada = sc.nextIntArray(n);
		TreeSet <Integer> valores = new TreeSet <Integer> ();
		TreeMap <Integer, Integer> mapeo = new TreeMap <Integer, Integer> ();
		for(int i : entrada)
			valores.add(i);
		int tamAlfabeto = 1;
		for(int i : valores)
			mapeo.put(i, tamAlfabeto++);
		int[] entradaMapeada = new int[entrada.length];
		for(int i = 0; i < entradaMapeada.length; i++)
			entradaMapeada[i] = mapeo.get(entrada[i]);
		SuffixArray suffix = new SuffixArray(entradaMapeada);
		ArrayList <Pair> repeats = suffix.darRepeats();
		Collections.sort(repeats);
		int leftMost = 0;
		for(Pair p : repeats)
		{
			if(p.a >= leftMost)
				leftMost = p.b;
		}
		System.out.println(entrada.length - leftMost);
		StringBuilder sb = new StringBuilder();
		for(int i = leftMost; i < entrada.length; i++)
			sb.append(entrada[i]).append(' ');
		System.out.println(sb.toString());
	}

}