package com.company;

import java.util.ArrayList;
import java.util.Stack;

public class Main {

    public static boolean check(int a){
        Stack<Integer> stack = new Stack<>();

        while(a != 0){
            stack.add(a%10);
            a = a/10;
        }
        int pref = 0;
        while(!stack.isEmpty()){
            if(stack.peek() < pref){
                return false;
            }
            pref = stack.pop();
        }
        return true;
    }
    public static boolean checkArray(int[] a){
        for(int i = 0; i < a.length; i++){
            if(!check(a[i])){
                return false;
            }
        }
        return true;

    }

    public static int solution(int[][] arr){
        int res = 0;
        for(int i = 0; i < arr.length;i++){
           if(checkArray(arr[i])){
               res++;
           }
        }
        return res;
    }

    public static void main(String[] args){
        System.out.println(check(21));
    }
}