#include <stdio.h>
#include <stdlib.h>
int main(){
  int n, a[100000], i, j, t, c=10000000;

  scanf("%d", &n);
  if(n == 1){ printf("0\n"); return 0;}

  for(i = 0; i < n; i++)
    scanf("%d", &a[i]);

  for(i = 0; i < n; i++){
    for(j = n -1; j > i; j--){
      if(a[i] > a[j]){
        t = a[i];
        a[i] = a[j];
        a[j] = t;
      }
    }
  }

  for(i = 0; i < n - 1; i++)
    if(a[i-1] - a[i] < c)
      c = a[i-1] - a[i];

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