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'use strict';

const fs = require('fs');

process.stdin.resume();

process.stdin.setEncoding('utf-8');

let inputString = '';

let currentLine = 0;

process.stdin.on('data', inputStdin => {

inputString += inputStdin;

});

process.stdin.on('end', _ => {

inputString = inputString.replace(/\s*$/, '')

.split('\n')

.map(str => str.replace(/\s*$/, ''));

main();

});

function readLine() {

return inputString[currentLine++];

}

// Complete the closestNumbers function below.

function closestNumbers(arr) {

arr = arr.sort((a, b) => a - b);

var minDiff = arr[1] - arr[0];

for (var i = 2; i != arr.length; i++) {

minDiff = Math.min(minDiff, arr[i] - arr[i - 1]);

}

let res = [];

for (var i = 0; i < arr.length - 1; i++) {

if (arr[i + 1] - arr[i]=== minDiff) {

res.push(arr[i]);

res.push(arr[i+1]);

}

}

console.log(minDiff);

return res;

}

function main() {

const ws = fs.createWriteStream(process.env.OUTPUT_PATH);

const n = parseInt(readLine(), 10);

const arr = readLine().split(' ').map(arrTemp => parseInt(arrTemp, 10));

let result = closestNumbers(arr);

ws.write(result.join(" ") + "\n");

ws.end();

}