70

#include<iostream>
using namespace std;
string s;
int main(){
    cin>>s;
    for(int i=s.size()-1;i>=0;i--){
        if(s[0]=='-'&&i==s.size()-1) cout<<'-';
        if(s[i]!='0'&&s[i]!='-') cout<<s[i];
    }
    return 0;
}