import * as fs from 'fs';
const input = fs.readFileSync('/dev/stdin', 'utf8');

const data = input.split('\n');
const N = parseInt(data[0]);
const xs = data[1].split(' ').map(s => parseInt(s));

xs.sort();

let min = undefined;
for (let i = 1; i < xs.length; i++) {
  if (xs[i - 1] !== xs[i]) {
    min = Math.min(min ?? 1000000, Math.abs(xs[i - 1] - xs[i]));
  }
}

console.log(min ?? 0);