fb_find_consecutive_digits.py

#!/usr/bin/env python3

import re
import sys

try:
  number = sys.argv[1]
except IndexError:
  number = '45333312884443'

store = {}
for match in re.finditer(r'(\d)\1*', number):
  digit = match.groups()[0]
  start, end = match.span()
  length = end - start

  if store.get(digit, {}).get('length', 0) < length:
    store[digit] = {
      'digit': digit,
      'length': length,
      'position': start + 1,
    }

result = max(store.values(), key=lambda x: x['length'])
print(f"""
Input: {number}
Consecutive digit: {result['digit']}
Length: {result['length']}
Position: {result['position']}
""")