You are given a code:

def main_solution(x):
    return ('pwln' + 'padd')

Can you predict the output of `main_solution("nwfqlbtjpg")` 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": "nwfqlbtjpg"}, "ref_output": "pwlnpadd", "ref_code": "def main_solution(x):\n    return ('pwln' + 'padd')", "funcname": "main_solution"}
rule