C :

#include<stdio.h>
int main()
{
	int a,b,c,d,n,e;
	scanf("%d",&n);
	a=n%10;
	b=(n%100)/10;
	c=(n%1000)/100;
	d=(n%10000)/1000;
	e=n/10000;
	if(e != 0)
	{
		printf("5\n%d%d%d%d%d",a,b,c,d,e);
	}
	else if(d  != 0)
	{
		printf("4\n%d%d%d%d",a,b,c,d);
	}
	else if(c != 0)
	{
		printf("3\n%d%d%d",a,b,c);
	}
	else if(b !=0)
	{
		printf("2\n%d%d",a,b);
	}
	else if(a !=0)
	{
		printf("1\n%d",a);
	}
	return 0;
}

C++ :

#include <iostream>
 using namespace std;
 int  main()
 {
     int n,a,b,c,d,e;
     cin>>n;
     a=n%10;
	 b=n/10%10;
	 c=n/100%10;
	 d=n/1000%10;
	 e=n/10000%10;
	 if(e>0)
	 {
	 	cout<<"5"<<endl;
	 	cout<<a<<b<<c<<d<<e;
	 }
	 else if(e==0&&d>0)
	 {
	 	cout<<"4"<<endl;
	 		cout<<a<<b<<c<<d;
	 }
	  else if(e==0&&d==0&&c>0)
	 {
	 	cout<<"3"<<endl;
	 	cout<<a<<b<<c;
	 }
	  else if(e==0&&d==0&&c==0&&b>0)
	 {
	 	cout<<"2"<<endl;
	 	cout<<a<<b;
	 }
	 else
	 {
	 	cout<<"1"<<endl;
	 	cout<<a;
	 }
     return 0;
 } 

Java :

import java.util.Scanner;
public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int a = sc.nextInt();
        int b = a;
        int n = 0;
        while (a>0){
            a/=10;
            n++;
        }
        System.out.println(n);
        for (int i = 0 ; i < n ;i++){
            System.out.print(b % 10);
            b/=10;
        }
    }
}

Python :

# coding=utf-8
#python2
x = int(input())
if(x>9999):
    y = 5;
else:
    if (x > 999):
        y = 4;
    else:
        if (x > 99):
            y = 3;
        else:
            if (x > 9):
                y = 2
            else:
                y = 1
print(y)
a=x//10000
b=x//1000%10
c=x//100%10
d=x//10%10
e=x%10
if y==1:
    print(e)
if y==2:
    print('%d%d'%(e,d))
if y==3:
    print('%d%d%d'%(e,d,c))
if y==4:
    print('%d%d%d%d'%(e,d,c,b))
if y==5:
    print('%d%d%d%d%d'%(e,d,c,b,a))

C# :

using System;
using System.Collections.Generic;
using System.Linq;
using System.Runtime.InteropServices;
using System.Security.Cryptography;
using System.Text;
using System.Threading.Tasks;

namespace ConsoleApp2
{
    internal class Program
    {
        static void Main()
        {
            string a = Console.ReadLine();
            Console.WriteLine(a.Length);
            for (int i = 0; i <= a.Length - 1; i++)
            {
                Console.Write(a[a.Length - i - 1]);
                

            }

            Console.ReadKey();
        }
    }
}