//入力文字読み取り
    process.stdin.resume();
    process.stdin.setEncoding('utf8');
    process.stdin.on('data', function (chunk) {

        //すべて受け取り改行で区切って格納
        var inputall = chunk.split("\n");

        //座標点の合計値
        var coordinateall =Number( inputall[0]);

        //座標点をひとつずつを配列に格納
        var coordinate = inputall[1].split(" ").map(Number);
        
        //座標点をソート
        coordinate.sort(
    function (a, b) {
        if (a < b) return -1;
        if (a > b) return 1;
        return 0;
    });

        var count = 10000000
        for (var i = 0; i < coordinateall-1; i++) {
            var coordinate_difference = coordinate[i + 1] - coordinate[i]
            if (coordinate_difference < count && coordinate_difference != 0) {
                count = coordinate_difference;
            }
        }
        console.log(count)
    });