#描述#
Now you are asked to measure a dose of medicine with a balance and a number of weights. Certainly it is not always achievable. So you should find out the qualities which cannot be measured from the range [1,S]. S is the total quality of all the weights.

#格式#
##输入格式##
The input consists of multiple test cases, and each case begins with a single positive integer N (1&lt=N&lt=100) on a line by itself indicating the number of weights you have. Followed by N integers Ai (1&lt=i&lt=N), indicating the quality of each weight where 1&lt=Ai&lt=100.

##输出格式##
For each input set, you should first print a line specifying the number of qualities which cannot be measured. Then print another line which consists all the unrealizable qualities if the number is not zero.

#样例1#
##样例输入1##

3
1 2 4
3
9 2 1

##样例输出1##

0
2
4 5

#限制#
1000ms
32768KB

#提示#

#来源#