#include <bits/stdc++.h>
int main() {
  int a, b, i = 1;
  scanf("%d%d", &a, &b);
  while (1) {
    if (i % 2 == 1)
      a = a - i;
    else
      b = b - i;
    if (a < 0) {
      printf("Vladik\n");
      break;
    } else if (b < 0) {
      printf("Valera\n");
      break;
    }
    i++;
  }
  return 0;
}
