#include <stdio.h>
#include <stdlib.h>
#define MAX 1000001

int comp(const void *arg1, const void *arg2) {
	return *(int *)arg1 - *(int *)arg2;
}

int main() {
	int n, x[100000], d, min = MAX, i;

	scanf("%d", &n);
	for (i = 0; i < n; i++) {
		scanf("%d", &x[i]);
	}
	
	qsort(x, n, sizeof(int), comp);
	for (i = 1; i < n; i++) {
		d = x[i] - x[i - 1];
		if (d < min && d > 0) min = d;
	}

	if (min == MAX) min = 0;
	
	printf("%d\n", min);
	return 0;
}