see what does this prob require:

For each integer input, the program should print exactly one line of output. Each line of output should contain the value N, right-justified in columns 1 through 5 with leading blanks, not leading zeroes. Columns 6 - 9 must contain " -> " (space hyphen greater space). Column 10 must contain the single last non-zero digit of N!

Isn't it stupid?

Well, this problem is obviously stolen from USACO.

well,Here is a demo of CPP
....
#include<iomanip>
.....
  cout << setw(5) << n << " -> " << ans << endl;

Sample Output
    1 -> 1
    2 -> 2
   26 -> 4
  125 -> 8
3125 -> 2
9999 -> 8

26 -> 4 ????????????