Consider the following well known rules:

- A number is divisible by 3 if the sum of its digits is divisible by 3. Let's call '3' a "1-sum" prime
- For 37, we take numbers in groups of threes from the right and check if the sum of these groups is divisible by 37. 
  Example: 37 * 123456787 = 4567901119 => 4 + 567 + 901 + 119 = 1591 = 37 * 43. Let's call this a "3-sum" prime because we use groups of 3.
- For 41, we take numbers in groups of fives from the right and check if the sum of these groups is divisible by 41. This is a "5-sum" prime.
- Other examples: 239 is a "7-sum" prime (groups of 7), while 199 is a "99-sum" prime (groups of 99).

Let's look at another type of prime:
- For 11, we need to add all digits by alternating their signs from the right. 
  Example: 11 * 123456 = 1358016 => 6-1+0-8+5-3+1 = 0, which is divible by 11. Let's call this a "1-altsum" prime
- For 7, we need to group the digits into threes from the right and add all groups by alternating their signs.
  Example: 7 * 1234567891234 = 8641975238638 => 638 - 238 + 975 - 641 + 8 = 742/7 = 106. 
- 7 is a "3-altsum" prime because we use groups of threes. 47 is a "23-altsum" (groups of 23), while 73 is a "4-altsum" prime (groups of 4).


You will be given a prime number `p` and your task is to find the smallest positive integer `n` such that `p’s` divisibility testing is `n-sum` or `n-altsum`.

For example:
```
solve(3) = "1-sum"
solve(7) = "3-altsum"
```
Primes will not exceed `50,000,000`. More examples in test cases. 

You can get some insight from [Fermat's little theorem](https://en.wikipedia.org/wiki/Fermat%27s_little_theorem). 

Good luck!

```python

USER_FILENAME = "<user_code>"
import sys, json, builtins
import math, heapq, bisect, itertools, functools, collections, statistics, fractions, decimal, operator, array, random, re, string, os, pathlib
try:
    import resource as _res
except Exception:
    _res = None
from collections import Counter, defaultdict, deque, OrderedDict
from functools import lru_cache, reduce
from itertools import accumulate, permutations, combinations, product
from math import gcd, ceil, floor, sqrt
from decimal import Decimal
try:
    from typing import *
except Exception:
    pass
try:
    sys.setrecursionlimit(1_000_000)
except Exception:
    pass
try:
    import site as _site
    try:
        _sys_sites = _site.getsitepackages() if hasattr(_site, "getsitepackages") else []
        for _p in _sys_sites:
            if _p and _p not in sys.path:
                sys.path.append(_p)
    except Exception:
        pass
    try:
        _usp = _site.getusersitepackages()
        if isinstance(_usp, str):
            _usp = [_usp]
        for _p in _usp:
            if _p and _p not in sys.path:
                sys.path.append(_p)
    except Exception:
        pass
except Exception:
    pass

def _disabled_input(*args, **kwargs):
    raise RuntimeError("input() is disabled in callable mode")
builtins.input = _disabled_input

ns = {"__name__": "__judge__"}  # prevent if __name__ == "__main__" blocks
for _k, _v in list(globals().items()):
    if not _k.startswith("_"):
        ns[_k] = _v
_CODE = 'def solve(p):\n    """See codewars.com kata Divisible by primes."""\n    n = p - 1\n    for f in factors(n):\n        m = n // f\n        if pow(10, m, p) == 1:\n            n = m\n    return \'%d-altsum\' % (n // 2) if n % 2 == 0 else \'%d-sum\' % n\n\n\ndef factors(n):\n    m = 2\n    while m * m <= n:\n        while n % m == 0:\n            yield m\n            n //= m\n        m += 1 if m == 2 else 2\n    if n > 1:\n        yield n\n'
_co = compile(_CODE, USER_FILENAME, "exec")
exec(_co, ns, ns)

_target = None
_fn_name = 'solve'
if _fn_name:
    if "Solution" in ns:
        try:
            _obj = ns["Solution"]()
            if hasattr(_obj, _fn_name):
                _target = getattr(_obj, _fn_name)
        except Exception:
            _target = None
    if _target is None and _fn_name in ns and callable(ns[_fn_name]):
        _target = ns[_fn_name]
# Fallback: if there's exactly one user-defined function, use it
if _target is None:
    _cands = [v for k, v in ns.items() if callable(v) and getattr(v, "__module__", "") in ("__judge__", "__main__")]
    _user_funcs = [c for c in _cands if getattr(c, "__name__", "").startswith("_") is False]
    if len(_user_funcs) == 1:
        _target = _user_funcs[0]
if _target is None:
    raise RuntimeError(f"Could not resolve callable '{_fn_name}'")

_raw = sys.stdin.read().strip()
if _raw:
    _parsed = json.loads(_raw)
    if isinstance(_parsed, dict):
        _kwargs = _parsed.get("kwargs", {})
        _args = _parsed.get("args", [])
    else:
        _args, _kwargs = _parsed, {}
else:
    _args, _kwargs = [], {}
if not isinstance(_args, (list, tuple)):
    _args = [_args]
_res = _target(*_args, **_kwargs)
try:
    sys.stdout.write(repr(_res) + "\n")
except Exception:
    pass

```

Measured memory_bytes: 5616