#include <cstdio>
#include <algorithm>

using namespace std;

int dat[100003];

int main(){
  int n;
  scanf("%d",&n);
  for( int i = 0 ;i < n; i ++) scanf("%d",&dat[i]);
  sort(dat,dat+n);
  int ans = 0;
  for (int i = 0; i + 1 < n; i++) {
    int cur = dat[i+1] - dat[i];
    if (cur == 0) continue;
    if (ans == 0 || ans > cur) {
      ans = cur;
    }
  }
  printf("%d\n", ans);
}