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);
    var res;
    a.sort();
    if(a.length>1){res = Math.abs(parseInt(a[1])-parseInt(a[0]));}
    else {res = 0;};
    var i = 2;
    while(i<a.length) {
        var t = Math.abs(parseInt(a[i])-parseInt(a[i-1]));
        if (parseInt(t)<parseInt(res)){res=t;}
        //console.log(t);
        i++;
    }
    console.log(res);

}