import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
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]);
        	for(int j=i;j>0;j--) {
        		if(X[j-1]>X[j]) {
        			int temp=X[j];
        			X[j]=X[j-1];
        			X[j-1]=temp;
        		}
        	}
        }
        int min=1000000;
        for(int i=1;i<N;i++) {
        	if(Math.abs(X[i-1]-X[i])<min) {
        		min=Math.abs(X[i-1]-X[i]);
        	}
        }
        System.out.println(min);
    }
}