C++ :

#include<iostream>
#include<cstdio>
using namespace std;

int a,ans;

int main()
{
//	freopen("al.in","r",stdin);
//	freopen("al.out","w",stdout);
	cin >>a;
	ans=0;
	for(; a>0; a/=10 )
	   if(a%10>0) ans=ans*10+a%10;
    a=ans;
    ans=0;
	for(; a>0; a/=10 )
	    ans=ans*10+a%10;   
	cout <<ans<<endl;
	return 0;
}