#include <stdio.h>
#include <stdio.h>
int comp(const void *a, const void *b){
  return *(int*)a - *(int*)b;
}

int main(){
  int n, a[100000], i, c=10000000;

  scanf("%d", &n);
  for(i = 0; i < n; i++)
    scanf("%d", &a[i]);
  qsort(a, n, sizeof(int), comp);
  
  for(i = 1; i < n; i++)
    if(a[i] != a[i-1] && a[i] - a[i-1] < c)
      c = a[i] - a[i-1];

  if(c == 10000000) c = 0;
  printf("%d\n", c);
  return 0;
}