package com.company;
import java.util.Scanner;
import java.util.Arrays;

public class Main {
    public static void main(String[] args) {
   // write your code here
        int key1 =0;
        int key2 =0;
        int key33 = 0;
        int KEY;
        int[] key3 = new int[4];

        Scanner girdi = new Scanner(System.in);
        System.out.println("Please write 1000 <= input1 <= 9999 ");
        int input1 = girdi.nextInt;
        System.out.println("Please write 1000 <= input2 <= 9999 ");
        int input2 = girdi.nextInt;
        System.out.println("Please write 1000 <= input3 <= 9999 ");
        int input3 = girdi.nextInt;

        while(input1 >= 1000) {
            input1 = input1 - 1000;
            input1 = input1;
        }
        while(input1 >= 100) {
            input1 = input1 - 100;
            key1 = key1 + 1;
        }
        while(input2 >= 100) {
            input2 = input2 - 100;
            input2 = input2;
        }
        while(input2 >= 10) {
            input2 = input2 - 10;
            key2 = key2 + 1;
        }

        key3[0]=input3/1000;  
        input3=input3-(1000*key3[0]);

        key3[1]=input3/100;   
        input3=input3-(100*key3[1]);

        key3[2]=input3/10;    
        input3=input3-(10*key3[2]);

        key3[3]=input3;     

        key33 = Arrays.stream(key3).max.getAsInt;

        KEY = (key1 * key2) - key33;

        System.out.println("Hundreds digit of input1 = " + key1);
        System.out.println("Tens digit of input2 = " + key2);
        System.out.println("Largest digit of input3 = " + key33);
        System.out.println("KEY = " + KEY);
        
    }
}