Problem:
Prime Factorization

Factorize a given integer n.

Input

n

An integer n is given in a line.

Output

Print the given integer n and :. Then, print prime factors in ascending order. If n is divisible by a prime factor several times, the prime factor should be printed according to the number of times. Print a space before each prime factor.

Constraints

2 ≤ n ≤ 109

Sample Input 1

12

Sample Output 1

12: 2 2 3

Sample Input 2

126

Sample Output 2

126: 2 3 3 7

Solution in JavaScript (judge verdict: Accepted)

var input = require('fs').readFileSync('/dev/stdin', 'utf8').trim();
//var input = 1463616;
var n = parseInt(input);
var on = n;

var primes = [];
while (n % 2 == 0) {
    primes.push(2);
    n = n / 2;
}
for (var i = 3; i * i <= n * n; i += 2) {
    while (n % i == 0) {
        primes.push(i);
        n /= i;
    }
}
if (n > 1) primes.push(n);

console.log(on + ': ' + primes.join(' '));