from typing import List
from typing import Tuple
from typing import Any


def find_groupped_index(groupping_list : List[Tuple[Any, List[str]]], key_to_check : Any) -> int:
    """Finds index of key in given list of tuples where first element of tuple is key."""
    
    for i, (key, _) in enumerate(groupping_list):
        if key == key_to_check:
            return i
    return -1