give '123456789' to any program which plays with it, then get the output and specify it as the first output of the command and then specify your input that you want to mangle in the same way as the second argument

mangler.py

#!/bin/env python3
from sys import argv
work = True if len(argv)>2 else False
if not work:
    exit()

pattern = '123456789'
mangled = argv[1]

res = []

for i in pattern:
    res.append(mangled.index(i))

inp = argv[2]
result = []

for i in res:
    result.append(inp[i])


print("".join(result))