process.stdin.resume();
process.stdin.setEncoding('ascii');

var input_stdin = "";
var input_stdin_array = "";
var input_currentline = 0;

process.stdin.on('data', function (data) {
    input_stdin += data;
});

process.stdin.on('end', function () {
    input_stdin_array = input_stdin.split("\n");
    main();    
});

function readLine() {
    return input_stdin_array[input_currentline++];
}

/////////////// ignore above this line ////////////////////
function absDiff(a, b) {
  return Math.abs(a - b);
}

function findMinAbs(array) {
  let min = absDiff(array[0], array[1]);
  for (let i = 1; i < array.length - 1; i++) {
    let diff = absDiff(array[i], array[i+1]);
    if (diff < min) {
      min = diff;
    }
  }
  return min;
};

function main() {
    var n = parseInt(readLine());
    a = readLine().split(' ');
    a = a.map(Number);
  let min = findMinAbs(a.sort((a, b) => (a - b)));
  console.log(min);
}