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);
    // your code goes here
    a.sort(function(a,b) {return Number(a) - Number(b)});
    var min_val = Math.abs(a[1] - a[0]);
    for (var i=2; i<n; i++) {
        min_val = Math.min(Math.abs(a[i] - a[i-1]), min_val);
    }
    //console.log(a.join(' '));
    console.log(min_val);
}