Prime Factors (25)

输入描述:

Each input file contains one test case which gives a positive integer N in the range of long int.

输出描述:

Factor N in the format N = p1^k1 * p2^k2 *...*pm^km, where pi's are prime factors of N in increasing order, and the exponent ki is the number of pi -- hence when there is only one pi, ki is 1 and must NOT be printed out.