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