#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <stdbool.h>
static int swap(const void* v1, const void* v2);
int main(void)
{
    int numofpoint;
    int distance[100000]={0};
    scanf("%d",&numofpoint);
    for(int i=0;i<numofpoint;i++)
    {
        scanf("%d",&distance[i]);
    }
    qsort(distance,numofpoint,sizeof(int),swap);
    int mindistance=1000000;
    for(int i=0;i<numofpoint-1;i++)
    {
        if(distance[i]==distance[i+1])
        {
            continue;
        }
        if(distance[i]-distance[i+1]<mindistance)
        {
            mindistance=distance[i]-distance[i+1];
        }
        
    }
    if(mindistance==1000000)
    {
        printf("0");
    }
    else
    {
        printf("%d",mindistance);
    }
    
    
}
int swap(const void* a, const void* b)
{
	return *(int*)b - *(int*)a;
}