#include<iostream> 
using namespace std; 
long long n,i = 1,ans = 0;
int main(){
	cin >> n;
    while(n){
        if(n % 10 != 0){
            ans += n % 10 * i;
            i *= 10;
        }
        n /= 10;
    }
    cout << ans;
    return 0;
}