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);
    a = a.sort(function(x, y) {
       if (x < y) {
           return -1;
       } else {
           return 1;
       }
    });
    
    var minAbsDiff = Math.abs(a[0] - a[1]);
    var i = 1;
    var right, left, x, y;
    while (i < n) {
        left = a[i];
        right = a[i + 1];
        
        if ((i + 1) >= n) {
            break;
        }
        
        y = Math.abs(left - right);
        minAbsDiff = Math.min(minAbsDiff, y);
        i++;
    }
    
    console.log(minAbsDiff);
}