#include<iostream>
#include<algorithm>
using namespace std;
using lint=int64_t;

int main()
{
	string S;
	string B[10];
	string name[2]={"oda","yukiko"};

	cin >> S;
	for(int i=0;i<8;i++)
		cin >> B[i];
	
	if(S=="yukiko")swap(name[0],name[1]);
	int cnt=0;
	for(int i=0;i<8;i++)
	{
		cnt+=count(B[i].begin(),B[i].end(),'w');
		cnt+=count(B[i].begin(),B[i].end(),'b');
	}

	cout << name[cnt%2] << endl;
	return 0;
}