C :

#include<stdio.h>
int main()
{
    int n,i,m,k,s=0;
    scanf("%d",&n);
    m=n;
    k=n;
    while(m!=0)
    {
        m=m/10;
        s++;
    }
    printf("%d\n",s);
    if(s==1)
        printf("%d\n",n);
    if(s==2)
        printf("%d %d\n",n/10,n%10);
    if(s==3)
        printf("%d %d %d\n",n/100,n/10%10,n%10);
    if(s==4)
        printf("%d %d %d %d\n",n/1000,n/100%10,n/10%10,n%10);
    if(s==5)
        printf("%d %d %d %d %d\n",n/10000,n/1000%10,n/100%10,n/10%10,n%10);
    for(i=0;i<s;i++)
    {
        printf("%d",k%10);
        k=k/10;
    }
    printf("\n");
    return 0;
}

C++ :

#include <iostream>

/* run this program using the console pauser or add your own getch, system("pause") or input loop */
using namespace std;
int main(int argc, char** argv) {
	int n;
	cin>>n;
	int sum=0;
	int s=1;
	int nn=n;
	int nnn=n;
	while(n>0){
		n=n/10;
		sum++;
		s=s*10;
	}
	s=s/10;
	cout<<sum<<endl; 

    while(s>0){ 
		cout<<nn/s<<" ";   
    	nn=nn%s;   
   	 	s=s/10;
	}
   cout<<endl;
   	while(nnn>0){
		cout<<nnn%10;
		nnn=nnn/10;
	}
	return 0;
	
}

Java :

import java.util.Scanner;
public class Main{
public static void main (String[] args){
	Scanner sc = new Scanner(System.in);
	int n = sc.nextInt();
	int w = 0;
		int a,b,c,d,e;
			if(n < 10 ) {
				 w = 1;
				System.out.println(w);
				System.out.println(n);
				System.out.println(n);
			}else if(n < 100) {
				w = 2;
				a = n / 10;
				b = n % 10;
				System.out.println(w);
				System.out.println(a +" " + b);
				System.out.println(b * 10 +  a);
			}else if(n < 1000) {
				w = 3;
				a = n / 100;
				b = n / 10 % 10;
				c = n % 10;
				System.out.println(w);
				System.out.println(a +" " + b + " " + c);
				System.out.println(c * 100 + b * 10 + a);
			}else if(n < 10000) {
				w = 4;
				a = n / 1000;
				b = n / 100 % 10;
				c = n / 10 % 10;
				d = n % 10;
				System.out.println(w);
				System.out.println(a +" " + b +" " + c + " " + d);
				System.out.println(d * 1000 + c * 100 + b * 10 +  a);
			}else if(n < 100000) {
				w = 5;
				a = n / 10000;
				b = n / 1000 % 10;
				c = n / 100 % 10;
				d = n / 10 % 10;
				e = n % 10;
				System.out.println(w);
				System.out.println(a +" " + b +" " + c + " " + d + " " + e);
				System.out.println(e * 10000 + d * 1000 + c * 100 + b * 10 +  a);
			}
			
	
		
}
			
		
		
		
}

Python :

# 接收输入一个不大于5位的数字
n = int(input())
# 初始化计数位数c
c = 0
a = []
# 初始化求和
b = 0
m = n
while n > 0:
    # s就是个位上的数字
    s = n % 10
    # 每次得出个位数,就加入到a列表中
    a.insert(0, s)
    # n地板除10,得出除了个位数以外的整数,进行下一次循环
    n //= 10
    # 计数位数自加1
    c += 1
print(c)

# 遍历列表,求出每一个元素,并打印输出
for v in a:
    print(v, end=' ')
print()
#逆序输出
while m > 0:
    #最先得出的余数乘以10,再加上第二次的余数,再循环得出逆序数
    b = b * 10 + m % 10
    m //= 10
print(b)