#include <iostream>
#include <cstdio>
#include <algorithm>
#include <stack>
#include <queue>
#include <string>
using namespace std; 
int main(){
	string s;
	cin >>s;
	int index=0;
	if(s[0]=='-') //字符  
	{
		index=1;
		cout <<"-";	
	}
	
	for(int i=s.length()-1;i>=index;i--)
	{
		
		if(s[i]>='0'&&s[i]<='9' && (i!=s.length()-1||s[i]!='0'))
			cout <<s[i];
	}
}