Because the only brainfuck instructions in your comment where a - which decrements and 20 +, each of which increments.Mine echos the first two characters from stdin, because of the commas and dots.
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The code seems to be C-style language with curly braces and types in front for variable declarations, probably java. This means the variable must be declared of screen before the loop or it would not compile. It could have a previous value or be uninitialized, but that does not affect the end result.