Все работает правильно
package com.javarush.task.task04.task0420;
import java.io.BufferedReader;
import java.io.InputStreamReader;
/*
Сортировка трех чисел
*/
public class Solution {
public static void main(String[] args) throws Exception {
//напишите тут ваш код
InputStreamReader inputStreamReader = new InputStreamReader(System.in);
BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(System.in));
int a = Integer.parseInt(bufferedReader.readLine () ) ;
int b = Integer.parseInt(bufferedReader.readLine () ) ;
int c = Integer.parseInt(bufferedReader.readLine () ) ;
int x = 0;
int y = 0;
if(c > b)
{
x = b;
b = c;
c = x;
}
if(b > a)
{
y = a;
a = b;
b = y;
}
System.out.println(a + " " + b + " " + c);
}
}