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

int main(void)
{
    int numofpoint;
    scanf("%d",&numofpoint);
    long long int pointlist[numofpoint];
    for(int i=0;i<numofpoint;i++)
    {
        scanf("%lld",&pointlist[i]);
    }
    for(int i=0;i<numofpoint-1;i++)
    {
        for(int j=i+1;j<numofpoint;j++)
        {
            if(pointlist[i]>pointlist[j])
            {
                int tmp=pointlist[i];
                pointlist[i]=pointlist[j];
                pointlist[j]=tmp;
            }
        }
    }
    int min=9999999;
    for(int i=0;i<numofpoint-1;i++)
    {
        for(int j=0;j<numofpoint;j++)
        {
            if(i==j)
            {
                continue;
            }
            if(pointlist[i+1]==pointlist[i])
            {
                if(pointlist[i]<min)
                {
                    min=pointlist[i+1];
                }
            }
            else if(pointlist[i+1]-pointlist[i]<min)
            {
                min=pointlist[i+1]-pointlist[i];
            }
        }
    }
    printf("%d",min);
}