You are given a code:

def main_solution(x):
    return ('src' + 'ftur')

Can you predict the output of `main_solution("tarpwi")` 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": "tarpwi"}, "ref_output": "srcftur", "ref_code": "def main_solution(x):\n    return ('src' + 'ftur')", "funcname": "main_solution"}
rule