#include <iostream>
#include <list>
#include <vector>
#include <string>
#include <stdio.h>
#include <stdint.h>
#include <iomanip>
using namespace std;

using uint = unsigned int;
using ll = long long;

#define CIN( LL , A ) LL A; cin >> A 
#define GETLINE( A ) string A; getline( cin , A ) 
#define FOR_ITR( ARRAY , ITR , END ) for( auto ITR = ARRAY .begin() , END = ARRAY .end() ; ITR != END ; ITR ++ ) 

int main()
{

  CIN( string , S );
  const string yukicoder = "yukicoder";
  const string q = "?";
  const uint& size = S.size();

  for( uint i = 0 ; i < size ; i++  ){

    const string c = S.substr( i , 1 );

    if( c == q ){

      cout << yukicoder[i] << endl;
      return 0;

    }

  }
  
  return 0;

}