It's been a tough week at work and you are stuggling to get out of bed in the morning.

While waiting at the bus stop you realise that if you could time your arrival to the nearest minute you could get valuable extra minutes in bed.

There is a bus that goes to your office every 15 minute, the first bus is at `06:00`, and the last bus is at `00:00`.

Given that it takes 5 minutes to walk from your front door to the bus stop, implement a function that when given the curent time will tell you much time is left, before you must leave to catch the next bus.

## Examples

```
"05:00"  =>  55
"10:00"  =>  10
"12:10"  =>  0
"12:11"  =>  14
```

### Notes

1. Return the number of minutes till the next bus
2. Input will be formatted as `HH:MM` (24-hour clock)
3. The input time might be after the buses have stopped running, i.e. after `00:00`

```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 = 'from datetime import datetime, timedelta\n\ndef bus_timer(current_time):\n    \n    ct = datetime.strptime(current_time, "%H:%M")\n    \n    if ct >= datetime.strptime("5:55", "%H:%M") and ct <= datetime.strptime("23:55", "%H:%M"):\n        if ct.minute <= 10:\n            time_left = 10 - ct.minute\n        elif ct.minute <= 25 and ct.minute > 10:\n            time_left = 25 - ct.minute\n        elif ct.minute <= 40 and ct.minute > 25:\n            time_left = 40 - ct.minute\n        elif ct.minute <= 55 and ct.minute > 40:\n            time_left = 55 - ct.minute\n        else:\n            time_left = 70 - ct.minute\n    else:\n        delta = datetime.strptime("5:55", "%H:%M") - ct\n        time_left = int(delta.seconds / 60)\n            \n    return time_left'
_co = compile(_CODE, USER_FILENAME, "exec")
exec(_co, ns, ns)

_target = None
_fn_name = 'bus_timer'
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: 424255