You are given a code:

def main_solution(x):
    return (('pmtpfq').capitalize() + func_13('obxj', '-'))

Can you predict the output of `main_solution("yayxcgivbk")` 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": "yayxcgivbk"}, "ref_output": "Pmtpfqo-b-x-j", "ref_code": "def main_solution(x):\n    return (('pmtpfq').capitalize() + func_13('obxj', '-'))", "funcname": "main_solution"}
rule