You are given a code:

def main_solution(x):
    return (func_1(x, 4) + func_15('mcuaw'))

Can you predict the output of `main_solution("mjpdrljm")` 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": "mjpdrljm"}, "ref_output": "mjpdrljmmjpdrljmmjpdrljmmjpdrljm\u00abm\u00bb\u00abc\u00bb\u00abu\u00bb\u00aba\u00bb\u00abw\u00bb", "ref_code": "def main_solution(x):\n    return (func_1(x, 4) + func_15('mcuaw'))", "funcname": "main_solution"}
rule