```
# Python 3 program to count unique elements
def count(arr, n):
# Mark all array elements as not visited
visited = [False for i in range(n)]
# Traverse through array elements
# and count frequencies
for i in range(n):
# Skip this element if already
# processed
if (visited[i] == True):
continue
# Count frequency
count = 1
for j in range(i + 1, n, 1):
if (arr[i] == arr[j]):
visited[j] = True
count += 1
if count != 1 :
print(arr[i]);
# Driver Code
arr = [10, 30, 40, 20, 10, 20, 50, 10]
n = len(arr)
count(arr, n)
```