#include<iostream> #include<cmath> using namespace std; int main(){ int n,a[1145],minn=4294967295; cin>>n; for(int i=0;i<n;i++){ cin>>a[i]; }for(int i=0;i<n;i++){ for(int j=i+1;j<n;j++){ minn=min(minn,max(a[i],a[j])-min(a[i],a[j])); } }cout<<minn; return 0; }