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 = a.sort(function(a,b){return a-b;});
    var diff;
    for(var i=0,length=a.length;i<length-1;i++){
        var A = Math.abs(a[i]-a[i+1]);
        if(diff== undefined){
            diff= A;
        }else{
            diff = diff<A?diff:A;
        }
    }
    console.log(diff);

}