(This answer was kept intentionally high-level since I am sure that no one prints numbers in the mips assembly unless they do this for homework.)
If you do not mind getting it in hexadecimal, this is not a problem; just type one word in hexadecimal, and then the following. Remember to include leading zeros in the second word! (In fact, I think that the spim that I suppose you use can only print in base 10, so even this can be a little tricky).
10, , "--". " " ; C, - - - . , 10, . mips 64- ( ), .