import java.util.Scanner;

class Main {

	
	
	public static void main(String[] args) {
		Scanner sc=new Scanner(System.in);
		String x="";
         int c1=1,c2=1,n=1;
         c1=1;
        	while (!x.equals("0 0 0"))
        	{
        		x=sc.nextLine();
        		int a=x.indexOf(' ');
        		int b=x.lastIndexOf(' ');
        		if (!x.equals("0 0 0"))
        		{
        			String m=x.substring(0, a);
        			char c3=x.charAt(a+1);
        			char c4=x.charAt(b+1);
        			String result=m.replace(""+c3,""+c4);
        			while (result.length()>0 && result.charAt(0)=='0')
        			{
        				result=result.substring(1); 
        			}
        			System.out.println(result);
        		}
        	}
	}

}