def equilibrium_index(arr):
  
  total_sum = sum(arr)
  left_sum=0
  for i, num in enumerate(arr):
    total_sum -= num
    if left_sum == total_sum:
      return i
    left_sum += num
  return -1
def similar_elements(test_tup1, test_tup2):
  
  res = tuple(set(test_tup1) & set(test_tup2))
  return (res) 