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

const [NStr, xArrStr] = input.split('\n');
const N = parseInt(NStr);
const xs = xArrStr.split(' ').map(s => parseInt(s));

if (N === 1) {
  console.log(0);
} else {
  let min = 1000000;
  for (let i = 1; i < xs.length; i++) {
    min = Math.min(min, Math.abs(xs[i - 1] - xs[i]));
  }

  console.log(min);
}