You are given a code:

def main_solution(x):
    return ('txmp' + x)

Can you predict the output of `main_solution("usxltcdspe")` 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": "usxltcdspe"}, "ref_output": "txmpusxltcdspe", "ref_code": "def main_solution(x):\n    return ('txmp' + x)", "funcname": "main_solution"}
rule