You are given a code:

def main_solution(x):
    return ('daycr' + 'umre')

Can you predict the output of `main_solution("srtzto")` 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": "srtzto"}, "ref_output": "daycrumre", "ref_code": "def main_solution(x):\n    return ('daycr' + 'umre')", "funcname": "main_solution"}
rule