#include<bits/stdc++.h>
// #include<atcoder/all>
// #include<boost/multiprecision/cpp_int.hpp>

using namespace std;
// using namespace atcoder;
// using bint = boost::multiprecision::cpp_int;
using ll = long long;
using ull = unsigned long long;
using P = pair<int,int>;
#define rep(i,n) for(ll i = 0;i < (ll)n;i++)
#define ALL(x) (x).begin(),(x).end()
#define MOD 1000000007



int main(){
  
  string s;
  cin >> s;
  if(s[0] == '-')cout << 0 << "\n";
  else {
    if(s.size() <= 2)cout << 0;
    else rep(i,s.size()-2)cout << s[i];
    cout << "\n";
  }
  

  return 0;
}