#include <bits/stdc++.h>
int main() {
  int J, M;
  float QJ, QM;
  int i;
  scanf("%d", &J);
  scanf("%d", &M);
  i = 1;
  while (1) {
    J = J - i;
    if (J < 0) {
      printf("Vladik\n");
      break;
    }
    i++;
    M = M - i;
    if (M < 0) {
      printf("Valera\n");
      break;
    }
    i++;
  }
  return 0;
}
