#include <bits/stdc++.h>

using namespace std;
typedef std::map<int, int>::iterator it_type;
int main(){
    int n;
    cin >> n;
    vector<int> a(n);
    for(int a_i = 0; a_i < n; a_i++){
       cin >> a[a_i];
    }
    std::map<int,int> Map;
    for (int k=0;k<a.size();k++){
        if (Map.find(a[k])!=Map.end()) {cout<<0<<endl;return 0;}
        Map[a[k]]=k;}
    int MinVal = 1000000000;it_type itt = Map.end();itt--;
    for (it_type it = Map.begin(); it!=itt;it++ ){
        int val1 = a[it->second];it_type it1 = it;
        it1++;
        int val2 = a[it1->second];
        MinVal = min(MinVal,abs(val2-val1));
    }
    cout<<MinVal<<endl;
    // iterator->first = key
    // iterator->second = value
    // Repeat if you also want to iterate through the second map.
return 0;

}