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 main() {
  var n = parseInt(readLine());
  a = readLine().split(' ');
  a = a.map(Number);
  b = a.slice();
  let diff = [];
  
  a.forEach((item, index) => {
    b.forEach((item1, index1) => {
      if (item !== item1) diff.push(Math.abs(item - item1));
    
      b.splice(index1, 1);
    })
  })
  
  process.stdout.write(diff.sort()[0]);
}