#include<bits/stdc++.h>
using namespace std;
#define ii int
#define ll long long
#define cc char
#define dd double
#define in cin
#define out cout
#define pp printf
#define bb bool
int main()
{
	ii a[105]={};
	
	for(int i=0;;i++){
		cin>>a[i];
		if(a[i]==0){
			break;//TODO
		}//TODO
	}
	for(int i=101;i>=0;i++){
		if(a[i]==0){
			continue;//TODO
		}//TODO
		cout<<a[i];
	}
	return 0;
}