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I hope you're not hard coding passwords, here's a few lines to generate a random alphanumeric char. Use as you will.

final String selectionString = '0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz';
Integer idNum = Math.mod(Math.abs(Crypto.getRandomInteger()), selectionString.length());
String randomChar = selectionString.substring(idNum, idNum+1);