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.*;
    import java.util.*;

    public class Main {
    
    public static void main(String[] args) throws IOException{
        //FastScanner in = new FastScanner(new FileInputStream(new File("phi.in")));
        //PrintWriter out = new PrintWriter(new File("output.txt"));
        PrintWriter out = new PrintWriter(System.out);
        FastScanner in = new FastScanner(System.in);
        new Main().solveC(in, out);
        out.close();
        System.exit(0);
    }
    
    /* begin() */
    
    void solveA(FastScanner in, PrintWriter out){
        
    }
    
    void solveB(FastScanner in, PrintWriter out){
    }
    
    void solveC(FastScanner in, PrintWriter out){
        char[] s = in.next().toCharArray();
        char[] cmp = "abcdefghijklmnopqrstuvwxyz".toCharArray();
        boolean p = false;
        int j = 0;
        for(int i=0; i<s.length; i++){
            if(s[i] > cmp[j]) continue;
            s[i] = cmp[j];
            j++;
            if(j>25){
                p = true;
                break;
            }
        }
        if(!p) out.println(-1);
        else out.println(String.valueOf(s));
    }
    
    void solveD(FastScanner in, PrintWriter out){
    }
    
    
    /* end() */
    
    private static class FastScanner {

        private final InputStream stream;
        private final byte[] buf = new byte[1024];
        private int curChar;
        private int numChars;

        public FastScanner(InputStream stream) {
            this.stream = stream;
        }

        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++];
        }

        boolean isSpaceChar(int c) {
            return c == ' ' || c == '\n' || c == '\r' || c == '\t' || c == -1;
        }

        boolean isEndline(int c) {
            return c == '\n' || c == '\r' || c == -1;
        }

        public int nextInt() {
            return Integer.parseInt(next());
        }


        public long nextLong() {
            return Long.parseLong(next());
        }

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

        public String next() {
            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 String nextLine() {
            int c = read();
            while (isEndline(c)) {
                c = read();
            }
            StringBuilder res = new StringBuilder();
            do {
                res.appendCodePoint(c);
                c = read();
            } while (!isEndline(c));
            return res.toString();
        }
    }
}