#include <bits/stdc++.h>
using namespace std;
#define REP(i,a,n) for(int i=(a); i<(int)(n); i++)
#define rep(i,n) REP(i,0,n)
#define FOR(it,c) for(__typeof((c).begin()) it=(c).begin(); it!=(c).end(); ++it)
#define ALLOF(c) (c).begin(), (c).end()
typedef long long ll;
typedef unsigned long long ull;


int main(){
  string s;
  cin >> s;
  
  map<char,int> cnt, correct;
  string t = "yukicoder";
  rep(i,t.size()){
    correct[t[i]]++;
  }

  rep(i,s.size()){
    cnt[s[i]]++;
  }

  FOR(it,correct){
    if(cnt[it->first] != it->second){
      cout << it->first << endl;
    }
  }
  
  return 0;
}