import java.util.Scanner;

    public class Main {
        static Scanner sc=new Scanner(System.in);
        static int key,len;
        static String flagseq;
        static int curMod;
        public static void main(String[] args){
            key=sc.nextInt();
            len=sc.nextInt();
            flagseq=sc.next();
            curMod=0;
            String num="";
            String app="";
            if(flagseq.charAt(0)=='1' && key==10){
                System.out.println(-1);
                return;
            }
            for(int i=0;i<len;i++){
                curMod*=10;
                curMod=curMod%key;
                if(flagseq.charAt(i)=='0'){
                    if(curMod==0){
                        app="1";
                    }
                    else{
                        app="0";
                    }
                }
                else{
                    if(curMod==0){
                        if(num==""){
                            app=key+"";
                        }
                        else{
                            app="0";
                        }
                    }
                    else{
                        int temp=key;
                        temp-=curMod;
                        app=temp+"";
                    }
                }
                int newMod=curMod;
                newMod+=Integer.parseInt(app);
                newMod=newMod%key;
                curMod=newMod;
                num+=app;
            }
            System.out.println(num);
        }
    }