#include <stdio.h>
#include <math.h>

#define ArraySize 100000

int main(void){
	int Array[ArraySize];
	int n = 0;
	int x = 0;
	int ArrayLength = 0;

	scanf("%d", &n);
	ArrayLength = n;
	for(int i = 0;i < n;i++){
			if(i == 0){
					scanf("%d", &Array[i]);
			}else{
					scanf("%d", &x);
					if(x == Array[i-1]){
							ArrayLength--;
					}else{
							Array[i] = x;
					}
			}
	}

	if(ArrayLength == 1){
			printf("0\n");
			return 0;
	}

	for(int i = 0; i < ArrayLength;i++){
			for(int j = ArrayLength-1;j > i; j--){
					if(Array[j] < Array[j-1]){
							x = Array[j];
							Array[j] = Array[j-1];
							Array[j-1] = x;
					}
			}
	}
	
	x = 1000000;

	for(int i = ArrayLength-1;i > 0;i--){
			n = Array[i] - Array[i-1];
			if(x > n){
					x = n;
			}
	}

	printf("%d\n", x);
	return 0;
}