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 sortNumber(a,b) {
    return a - b;
}

function main() {
    var n = parseInt(readLine());
    a = readLine().split(' ');
    a = a.map(Number);
    // your code goes here
    
    if (n < 2 || n > 100000) {
        console.log("n is out of range");
        return;
    }
    
   
    for (var i = 0; i < n; i ++) {
        if (a[i] < -10e9 || a[i] > 10e9) {
            console.log("number out of range: ", a[i], ":", -10e9);
            return;
        }
    }
    
    var minAbs = 30e9;

    a.sort(sortNumber);
    for (var i = 0; i < n-1; i++) {
        var abs = Math.abs(a[i] - a[i+1]);
        if (abs < minAbs) {
            minAbs = abs;
        }
    }
    
    console.log(minAbs);

}