1228.java

//https://codeforces.com/contest/1228/problem/A

import java.io.*;
import java.util.*;
import java.io.BufferedReader; 
import java.io.IOException; 
import java.io.InputStreamReader; 
// import java.util.Scanner; 
import java.util.StringTokenizer; 
  
public class distinctDigit
{ 
    static class FastReader 
    { 
        BufferedReader br; 
        StringTokenizer st; 
  
        public FastReader() 
        { 
            br = new BufferedReader(new
                     InputStreamReader(System.in)); 
        } 
  
        String next() 
        { 
            while (st == null || !st.hasMoreElements()) 
            { 
                try
                { 
                    st = new StringTokenizer(br.readLine()); 
                } 
                catch (IOException  e) 
                { 
                    e.printStackTrace(); 
                } 
            } 
            return st.nextToken(); 
        } 
  
        int nextInt() 
        { 
            return Integer.parseInt(next()); 
        } 
  
        long nextLong() 
        { 
            return Long.parseLong(next()); 
        } 
  
        double nextDouble() 
        { 
            return Double.parseDouble(next()); 
        } 
  
        String nextLine() 
        { 
            String str = ""; 
            try
            { 
                str = br.readLine(); 
            } 
            catch (IOException e) 
            { 
                e.printStackTrace(); 
            } 
            return str; 
        } 
    } 
  
    public static void main(String[] args) 
    { 
        FastReader in = new FastReader(); 
        int l = in.nextInt();
        int r = in.nextInt();
        int f=0;
        for (int i=l ; i<=r ; i++) 
        { 
            int num = i; 
            boolean visited[] = new boolean[100];  
            while (num != 0) 
            { 
                if (visited[num % 10]) 
                    break; 
       
                visited[num%10] = true; 
       
                num = num/10; 
            } 
            if (num == 0){ 
                f=1;
                System.out.print(i);
                break; 
            }
        } 
        if(f==0) {
            System.out.println(-1);
        }
    }
}