import java.io.BufferedReader; import java.io.IOException; import java.io.InputStreamReader; import java.util.Arrays; public class Test{ public static void main(String[] args) throws IOException{ BufferedReader buf = new BufferedReader(new InputStreamReader(System.in)); int N = Integer.parseInt(buf.readLine()); String[] s = buf.readLine().split(" "); int X[] = new int[N]; X[0]=Integer.parseInt(s[0]); for(int i=1;i<N;i++) { X[i]=Integer.parseInt(s[i]); } Arrays.sort(X); int min=1000001; for(int i=1;i<N;i++) { if(Math.abs(X[i-1]-X[i])<min && X[i-1]!=X[i]) { min=Math.abs(X[i-1]-X[i]); } } if(min==1000001)System.out.println(0); else System.out.println(min); } }