main.py

def getRootProperty(source, needle):
    returnable = list(source)
    sequence = 0
    for root in source.items():
        for i, j in enumerate(str(root)):
            try:
                no_numbers = not str(root)[i - 1].isdigit() and not str(root)[i + 1].isdigit() and str(needle) not in root[0]
            except IndexError:
                no_numbers = True
            if j == str(needle) and no_numbers:
                print(str(root))
                return returnable[sequence]
        sequence += 1
    return False