какие ваши мысли?
package com.javarush.task.pro.task03.task0305;
import java.util.Scanner;
/*
Три числа
*/
public class Solution {
public static void main(String[] args) {
//напишите тут ваш код
Scanner cons = new Scanner(System.in);
int a = cons.nextInt();
int b = cons.nextInt();
int c = cons.nextInt();
boolean vse = (a == b) && (b == c);
if (a == b){
System.out.println(a + " " + b);
}
if (b == c){
System.out.println(b + " " + c);
}
if (a == c){
System.out.println(a + " " + c);
}
else if (vse){
System.out.println(a + " " + b + " " + c);
}
}
}