#include <iostream>
#include <vector>
#include <cmath>

using namespace std;

vector <int> numbers;

int main(){

int arraySize;
cin >> arraySize;

int numbers [arraySize];

for (int i = 0; i < arraySize; i++){
    cin >> numbers [i];
}

int absRecord = INT8_MAX;
int absMin;

for (int i = 0; i < arraySize; i++){
    for (int k = 0; k < arraySize; k++){

        if (i != k){
            absMin = abs (numbers [i] - numbers [k]);
        }

        if (absMin < absRecord ){
            absRecord = absMin;
        }
    }
}

if (arraySize > 1){
cout << absRecord << endl;
} else {
    cout << 0 << endl;
}


return 0;
}