You are given a code:

def main_solution(x):
    return ('yzq' + 'ikeh')

Can you predict the output of `main_solution("ucu")` 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": "ucu"}, "ref_output": "yzqikeh", "ref_code": "def main_solution(x):\n    return ('yzq' + 'ikeh')", "funcname": "main_solution"}
rule