#include<bits/stdc++.h> using namespace std; int main() { int a, b, c; cin >> a >> b >> c; if (a + b > c && b + c > a && a + c > b) { if (a == b && b == c) { cout << "db"; } else if (a == b || b ==c || a == c) { cout << "dy"; } else cout << "yb"; } return 0; }