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());
  var arr = readLine().split(' ').map(Number).sort((a, b) => a - b);

  var diff = Number.MAX_VALUE;

  for (var i=0; i<n-1; i++) {
    if (arr[i+1] - arr[i] < diff) {
      diff = arr[i+1] - arr[i];
    } 
  }

  console.log(diff)
}