Rebus problem solver (repl.it/repls/SizzlingBisqueIntegers to run)

solver.py

from itertools import permutations
from functools import reduce
import sys

si = ""
print("Rebus SolvR by Neverik. Copyright 2018.")
print("Enter text or 'exit' to escape.")
while True:
  sinp = input("Enter: ")
  for i in sinp:
    if not i.isalnum():
      raise ValueError("Bad text")
  if sinp == "exit":
    break
  si += sinp
  sinp = input("Operator: ")
  if sinp == "exit":
    break
  if sinp in "+-**/=":
    if sinp == "=":
      si += "=="
    else:
      si += sinp
  else:
    raise ValueError("Bad operator")
s = "".join([(("{" + i + "}")*(str(i).isalpha()) or str(i)) for i in si])

print("Processing...")

keys = [i for i in si if str(i).isalpha()]
ns = [i for i in si if str(i).isnumeric()]
seps = [i for i in si if not (str(i).isnumeric() or str(i).isalpha())]

def r(a, t):
  p = list(a)[:]
  try:
    p.remove(int(t))
  except ValueError:
    pass
  return p

nums = reduce(r, ns, list(range(10)))

print("Bruteforcing...")
print()

solved = False

for i in permutations(nums, r=len(keys)):
  d = {key:t for key,t in zip(keys, i)}
  n = s.format(**d)
  try:
    if eval(n):
      print("Result found: ", end='')
      print(n)
      solved = True
      break
  except ZeroDivisionError:
    continue
  except SyntaxError:
    continue


if solved:
  print()
  print("Thanks for using Rebus SolvR!")
  rate = input("Leave a rating from 1 to 3: ")
  try:
    a = int(rate)
  except ValueError:
    print("Sorry, you didn't enter an integer.")
  else:
    if a == 42:
      print("You are the true master.")
    elif a > 3:
      print("Thanks a LOT!")
    elif a == 3:
      print("Thanks!")
    elif a == 2:
      print("Please write a comment at gist.github.com/Neverik/3d0639f66f9ca727d682747de926657a. Let me know what's wrong.")
    elif a < 2:
      print("I'm sorry it didn't help. Please write a comment at gist.github.com/Neverik/3d0639f66f9ca727d682747de926657a. Let me know what's wrong.")
else:
  print()
  print("Sorry, no solution found. Please check that you've entered everything correctly.")

Awsum.