#include<stdio.h>
#include<stdlib.h>
#include<algorithm>
using namespace std;
int X[100000];
main(){
    int N;
    scanf("%d",&N);
    for(int i = 0;i < N;i++){
        scanf("%d",&X[i]);
    }
    sort(X,X+N);
    int min = 1000000000;
    for(int i = 0;i < N-1;i++){
        int dif = abs(X[i+1]-X[i]);
        if(dif && dif < min){min = dif;}
    }
    if(min == 1000000000){min = 0;}
    printf("%d\n",min);
}