java 代码

import java.util.*;
public class Main{
    public static void main(String fa[]){
        Scanner s=new Scanner(System.in);
        String x=s.nextLine();
        String [] a=x.split(" ");
        int k=a.length;
        String u=new String("");
        String b=s.next(),c=s.next();
        for(int i=0;i<k;i++){
            if(a[i].equals(b)) u+=c;
            else u+=a[i];
            u+=" ";
        }
        System.out.println(u);
    }
}