## Task:

You have to write a function `pattern` which returns the following Pattern(See Examples) upto n number of rows. 

* Note:```Returning``` the pattern is not the same as ```Printing``` the pattern.

### Rules/Note:

* The pattern should be created using only unit digits.
* If `n < 1` then it should return "" i.e. empty string.
* `The length of each line is same`, and is equal to the number of characters in a line i.e `n`.
* Range of Parameters (for the sake of CW Compiler) :
  + `n ∈ (-50,150]`
   
### Examples:

 + pattern(8):

       88888888
       87777777
       87666666
       87655555
       87654444
       87654333
       87654322
       87654321
       
 + pattern(17):
   
       77777777777777777
       76666666666666666
       76555555555555555
       76544444444444444
       76543333333333333
       76543222222222222
       76543211111111111
       76543210000000000
       76543210999999999
       76543210988888888
       76543210987777777
       76543210987666666
       76543210987655555
       76543210987654444
       76543210987654333
       76543210987654322
       76543210987654321


[List of all my katas]("http://www.codewars.com/users/curious_db97/authored")

```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 pattern(n):\n    d = int(str(n)[-1])\n    ptn = str(d) * n\n    arr = [ptn]\n    for i in range(n-1):\n        if ptn[-1] != '0':\n            ptn = ptn[:i+1] + str(int(ptn[-1])-1) * (n-i-1)\n        else:\n            ptn = ptn[:i+1] + '9' * (n-i-1)\n        arr.append(''.join(ptn))\n    result = ('\\n').join(arr)\n    return result\n"
_co = compile(_CODE, USER_FILENAME, "exec")
exec(_co, ns, ns)

_target = None
_fn_name = 'pattern'
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: 5786