./Main.java:42: error: cannot find symbol
					if(!tem.equals(""))tem+="+";
					    ^
  symbol:   variable tem
  location: class Main
./Main.java:42: error: cannot find symbol
					if(!tem.equals(""))tem+="+";
					                   ^
  symbol:   variable tem
  location: class Main
./Main.java:43: error: cannot find symbol
					tem+="2("+cun.get(index)+")";
					^
  symbol:   variable tem
  location: class Main
./Main.java:45: error: cannot find symbol
					if(!tem.equals(""))tem+="+";
					    ^
  symbol:   variable tem
  location: class Main
./Main.java:45: error: cannot find symbol
					if(!tem.equals(""))tem+="+";
					                   ^
  symbol:   variable tem
  location: class Main
./Main.java:46: error: cannot find symbol
					tem+=cun.get(index);
					^
  symbol:   variable tem
  location: class Main
6 errors

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