// editor3
import java.util.Scanner;
public class string{
    public static void main(String[] args){
        Scanner sc=new Scanner(System.in);
        String s=sc.next();
        char fc=sc.next().charAt(0);
        char sch=sc.next().charAt(0);
        String result=" ";
        if(!sc.hasNextChar){
            System.out.println("Invalid input");
        }
        int len=s.length();
        for(int i=0;i<len;i++){
            char ch=s.charAt(i);
            if(ch==fc){
                result+=sch;
            }
            else{
                result+=ch;
            }
        }
        System.out.println(result);
    }
}