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).sort(function(a,b){
        return parseInt(a) - parseInt(b);
    });
    // your code goes here
    //console.log(a);
    var min = a[1] - a[0];
    
    for(let i = 2; i < a.length; i++){
        let diff = a[i] - a[i-1];
        min = Math.min(diff, min);
    }
    console.log(min);

}