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

int cmp(const void *a,const void *b){
    if(*(int*)a>*(int*)b){return 1;}
    else if(*(int*)a<*(int*)b){return -1;}
    else {return 0;}
}


int main(void){
int n,x[100003];
int min=199191919;
scanf("%d",&n);

for(int i=0;i<n;i++){
    scanf("%d",&x[i]);
}


qsort(x,n,sizeof(int),cmp);

if(n==1){printf("0\n");return 0;}
for(int i=1;;i++){
    if(i==n){printf("0\n");return 0;}
    if(x[i]!=x[i-1]){break;}
}



for(int i=1;i<n;i++){
    if(x[i]==x[i-1]){continue;}
    if(min>=abs(x[i]-x[i-1])){min=abs(x[i]-x[i-1]);}
}
printf("%d",min);


}