You are given a code:

def main_solution(x):
    return ('lkfv' + 'qls')

Can you predict the output of `main_solution("uclzkuercx")` 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": "uclzkuercx"}, "ref_output": "lkfvqls", "ref_code": "def main_solution(x):\n    return ('lkfv' + 'qls')", "funcname": "main_solution"}
rule