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()
    var sum;
    var smallest = Math.abs(a[0]- a[1])
    for (var i = 1; i < a.length-1; i++){
            sum = Math.abs(a[i]- a[i+1])
            if ( sum < smallest) {
                smallest = sum
            }
    }
    console.log(smallest)
}