Try this:

SWITCH: {
        $a >= 90 && do {print "A"; last SWITCH;};
        $a >=80 && do {print "B"' last SWITCH;};
        $a >=70 && do {print "C"; last SWITCH;};
        $a >=60 && do {print "D"; last SWITCH;};
        print "F";
}

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