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