You are given a code:

def main_solution(x):
    return func_17('itcm')

Can you predict the output of `main_solution("mrvr")` 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": "mrvr"}, "ref_output": "mcti", "ref_code": "def main_solution(x):\n    return func_17('itcm')", "funcname": "main_solution"}
rule