Given two strings s and t which consist of only lowercase letters.

String t is generated by random shuffling string s and then add one more letter at a random position.

Find the letter that was added in t.

Example:

Input:

s = "abcd"

t = "abcde"

Output:

e

Explanation:

'e' is the letter that was added.

/**

 * @param {string} s

 * @param {string} t

 * @return {character}

 */

var findTheDifference = function(s, t) {

    var ss = s.split('').sort();

    var st = t.split('').sort();

    var i = 0;

    while (1) {

        if (st[i] !== ss[i]) return st[i];

        i++;

    }

};