You are given a code:

def main_solution(x):
    return ('tmpwh' + 'gtzvj')

Can you predict the output of `main_solution("xpsrg")` 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": "xpsrg"}, "ref_output": "tmpwhgtzvj", "ref_code": "def main_solution(x):\n    return ('tmpwh' + 'gtzvj')", "funcname": "main_solution"}
rule