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 a-b;
    });
    //console.log(a);
    var min = 10000000000;
    for(i=1;i<n;++i){
        if(min > Math.abs(a[i]-a[i-1])){
            min = Math.abs(a[i]-a[i-1]);
        }
    }
    console.log(min);
}