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
    var diffs = [];
    var first = a.slice(0, 1);
    for (var i = 0; i < a.length; i++) {
        var num;
        if (a[i + 1] !== undefined) {
            num = Math.abs(a[i] - a[i+1]);
        } else {
            num = Math.abs(a[i] - a[0]);
        }
        diffs.push(num);
    }
    var result = Math.min.apply(null, diffs);
    console.log(result);
}