Given any positive integer , you are supposed to find all of its prime factors, and write them in the format = .
Input Specification
Each input file contains one test case which gives a positive integer in the range of long int.
Output Specification
Factor in the format =^*^*…*^, where 's are prime factors of in increasing order, and the exponent is the number of – hence when there is only one , is 1 and must NOT be printed out.