#include <stdio.h>
#include <stdbool.h>
#include <stdlib.h>

int compareIntegers(const void *a, const void *b) {
    return (*(int*)a - *(int*)b);
}

void main(void) {
	int n = 0;
	scanf("%d",&n);
	int numList[n];

	for(int i = 0; i < n ; i ++){
		scanf("%d",&numList[i]);
	}
	size_t arraySize = sizeof(numList) / sizeof(numList[0]);
	qsort(numList, arraySize, sizeof(int), compareIntegers);
	

	int min = numList[1] - numList[0];
	for(int i = 1 ;i < n-1;i++){
		if(numList[i+1] == numList[i]){
			continue;
		}
		if( (min == 0 || min > numList[i+1] - numList[i] ) && numList[i+1] - numList[i] != 0){
			min = numList[i+1] - numList[i];
		}
		if(min == 1){
			break;
		}
	}
	
	printf("%d",min);
}