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Using SageMath in a Unix pipe without creating files

I would like to run Sage as the middle of a Unix pipe, so that some program generates Sage input, pipes it to Sage, and another program reads the output.

$ MyProgram1 | sage | MyProgram2 > final_output

In principle, MyProgram1 will run for days, weeks or months producing hundreds of millions of inputs for Sage to process, while MyProgram2 will look out for the rare successful inputs.

I know that if I have a small amount of input, then I can create a file, say "input.sage" and then run "sage input.sage", but this creates an auxiliary file "" before it does anything else, and so is not suitable for hundreds of millions of inputs/outputs.