Question

Akshya is given a list of N integers. Each number in the list appears exactly for one number. help akshya by identifying the numbers which appeared exactly once in the list.

Input

The input contains a single-line comma-separated integers.

Output

The output contains a single-line comma-separated integers.

Sample Input1

8,9,5,8,5,6

Sample Output1

9,6

Sample Input2

1,2,3,4,5,1,2,3,4

Sample Output2

5

Answer 1

numbers = [int(i) for i in input().split(",")]
once = []
for i in range(len(numbers)):
	if numbers[i] not in numbers[:i] + numbers[i+1:]:
		once.append(numbers[i])
print(*once, sep=",")