Problem 9. Consider the following program mystery.-py: import stdio x = stdio.readString () y = stdio.readString () stdio.write(x + 'L' + y) stdio.write ('') stdio.write (y + 'R' + x) stdio.writeln () Next, suppose that the file input.txt Contains the two strings F and F separated by a space. What does the following command output? $ python3 mystery.py < input.txt | python3 mystery.py | python3 mystery.py

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