#include<bits/stdc++.h>
using namespace std;
int x[100010];
int main(){
int n;
cin>>n;
for(int i=0;i<n;++i){
cin>>x[i];
}
sort(x,x+n);
int inf =123456789;
int m=inf;
for(int i=0;i<n-1;++i)
if(x[i]!=x[i+1])
m=min(m,abs(x[i+1]-x[i]));
cout<<(m==inf?0:m)<<endl;
}