input: Write a python function to extract values from a list of dictionaries and return them in a list.
  assert extract_values([{'a': 1}, {'b': 2}, {'c': 3}]) == [1, 2, 3]
  assert extract_values([{'x': 10}, {'y': 20}, {'z': 30}]) == [10, 20, 30]
  assert extract_values([{'key1': 'value1'}, {'key2': 'value2'}, {'key3': 'value3'}]) == ['value1', 'value2', 'value3']
output: def extract_values(dicts):
      return [list(d.values())[0] for d in dicts]