Input File Format for NIST Test for Randomness

I wish to check the randomness of the 32-bits numbers generated via. a random number generator. I have 1000 numbers of 32-bits each. How should I create my ASCII file? What is the value for the bitstream in .\assess bitstream command? Is it '1000*32' or '1000' or '32'?

Reference: https://nvlpubs.nist.gov/nistpubs/legacy/sp/nistspecialpublication800-22r1a.pdf