You are given a code:

def main_solution(x):
    return (('qrdoib' + 'mgbc')).lower()

Can you predict the output of `main_solution("xsakjzwr")` without writing any code? Please reason and put your final answer in the following json format: {"output": <your output>}, where <your output> should be the final string.
user
{"ref_input": {"x": "xsakjzwr"}, "ref_output": "qrdoibmgbc", "ref_code": "def main_solution(x):\n    return (('qrdoib' + 'mgbc')).lower()", "funcname": "main_solution"}
rule