package Access;
import java.util.*;
public class alternatenumber  {
    public static void main(String [] argd){
       Scanner s=new Scanner(System.in);
       int n=6251;
       String str=Integer.toString(n);
       char [] arr=str.toCharArray();
       int c=check(arr);
       if(c==-1){
           System.out.println(n);
       }else{
           Arrays.sort(arr,c+1,arr.length);
           for (int i = 0; i <arr.length ; i++) {
               System.out.print(arr[i]);
           }
       }

    }
    public static int check(char [] arr){
        for (int i =arr.length-1; i >0; i--) {
            int a=arr[i];
            for (int j = i-1; j>=0 ; j--) {
                if(arr[i]>arr[j]){
                    int temp=arr[j];
                    arr[j]=arr[i];
                    arr[i]=(char)temp;
                    return j;
                }
            }
        }
        return -1;
    }
}