Problem: You are given a string s consisting of |s| small english letters.

In one move you can replace any character of this string to the next character in alphabetical order (a will be replaced with b, s will be replaced with t, etc.). You cannot replace letter z with any other letter.

Your target is to make some number of moves (not necessary minimal) to get string abcdefghijklmnopqrstuvwxyz (english alphabet) as a subsequence. Subsequence of the string is the string that is obtained by deleting characters at some positions. You need to print the string that will be obtained from the given string and will be contain english alphabet as a subsequence or say that it is impossible.

Input

The only one line of the input consisting of the string s consisting of |s| (1 ≤ |s| ≤ 105) small english letters.

Output

If you can get a string that can be obtained from the given string and will contain english alphabet as a subsequence, print it. Otherwise print «-1» (without quotes).

Examples

Input

aacceeggiikkmmooqqssuuwwyy


Output

abcdefghijklmnopqrstuvwxyz


Input

thereisnoanswer


Output

-1

Solution (in JAVA):

Solution:
import java.io.BufferedWriter;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.OutputStreamWriter;
import java.io.PrintWriter;
import java.io.Writer;
import java.util.Arrays;
import java.util.InputMismatchException;
import java.util.*;
import java.io.*;
import java.math.*;
public class Main
{
    
    public static long pow(long a, long b)
    {
        long result=1;
        while(b>0)
        {
            if (b % 2 != 0)
            {
                result=result*a;
                b--;
            } 
            a=a*a;
            b /= 2;
        }   
        return result;
    }
    public static BigInteger fact(long num)
    {
        BigInteger fact=new BigInteger("1");
        int i=0;
        for(i=1; i<=num; i++)
        {
            BigInteger bg=BigInteger.valueOf(i);
            fact=fact.multiply(bg);
        }
        return fact;
    }
    public static long gcd(long a, long b)
    {
        if (a == 0)
            return b;
        return gcd(b%a, a);
    }
    public static long lcm(int a,int b)
    {
        return a * (b / gcd(a, b));
    }
    public static long sum(int h)
    {
        return (h*(h+1)/2);
    }
    public static void main(String args[])throws IOException
    {
    //    InputReader in=new InputReader(System.in);
	//	OutputWriter out=new OutputWriter(System.out);
	    BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
        String s=br.readLine();
        int pos=0;
        char[] a=s.toCharArray();
        int n=s.length();
        int b=0;
        for(int i=0;i<n;i++)
        {
            b=a[i]-'a';
            if(b<=pos && pos<26)
            {
                b=pos;
                pos++;
                a[i]=(char)(b+'a');
            }
        }
        if(pos!=26)
        {
            System.out.println("-1");
        }
        else
        {
            String s1=new String(a);
            System.out.println(s1);
        }
    }
}
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
class InputReader {
	 
	private InputStream stream;
	private byte[] buf = new byte[1024];
	private int curChar;
	private int numChars;
	private SpaceCharFilter filter;
 
	public InputReader(InputStream stream) {
		this.stream = stream;
	}
 
	public int read() {
		if (numChars== -1)
			throw new InputMismatchException();
		if (curChar >= numChars) {
			curChar = 0;
			try {
				numChars = stream.read(buf);
			} catch (IOException e) {
				throw new InputMismatchException();
			}
			if (numChars <= 0)
				return -1;
		}
		return buf[curChar++];
	}
 
	public int readInt() {
		int c = read();
		while (isSpaceChar(c))
			c = read();
		int sgn = 1;
		if (c == '-') {
			sgn = -1;
			c = read();
		}
		int res = 0;
		do {
			if (c < '0' || c > '9')
				throw new InputMismatchException();
			res *= 10;
			res += c - '0';
			c = read();
		} while (!isSpaceChar(c));
		return res * sgn;
	}
 
	public String readString() {
		int c = read();
		while (isSpaceChar(c))
			c = read();
		StringBuilder res = new StringBuilder();
		do {
			res.appendCodePoint(c);
			c = read();
		} while (!isSpaceChar(c));
		return res.toString();
	}
 
	public boolean isSpaceChar(int c) {
		if (filter != null)
			return filter.isSpaceChar(c);
		return c == ' ' || c == '\n' || c == '\r' || c == '\t' || c == -1;
	}
 
	public String next() {
		return readString();
	}
 
	public interface SpaceCharFilter {
		public boolean isSpaceChar(int ch);
	}
}
 
class OutputWriter {
	private final PrintWriter writer;
 
	public OutputWriter(OutputStream outputStream) {
		writer = new PrintWriter(new BufferedWriter(new OutputStreamWriter(outputStream)));
	}
 
	public OutputWriter(Writer writer) {
		this.writer = new PrintWriter(writer);
	}
 
	public void print(Object...objects) {
		for (int i = 0; i < objects.length; i++) {
			if (i != 0)
				writer.print(' ');
			writer.print(objects[i]);
		}
	}
 
	public void printLine(Object...objects) {
		print(objects);
		writer.println();
	}
 
	public void close() {
		writer.close();
	}
 
	public void flush() {
		writer.flush();
	}
 
	}
 
    class IOUtils {
 
	public static int[] readIntArray(InputReader in, int size) {
		int[] array = new int[size];
		for (int i = 0; i < size; i++)
			array[i] = in.readInt();
		return array;
	}
 
	}