func_code: def swap_unique_keys_values(d):
      swp_d = {}
      nums = []
      final_nums = []
      dic = {}
      for lines in d:
          nums.append(str(d[lines]))
          swp_d[d[lines]] = lines
      for lines in nums:
          if nums.count(lines) == 1:
              final_nums.append(int(lines))
      for words in final_nums:
          dic[words] = swp_d[words]
      return dic