Merging Dictionaries - Optimum Style?

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For merging multiple dictionaries, proposed function dics_merge(), that alerts the user regarding presence of duplicate keys, affording option to permit overwriting or not, is placed below:

# Merge Dictionaries:
da = {"a":5, "b":10, "c":15, "d":20, "e":25}
db = {"f":55, "g":60, "h":65, "i":70, "j":75}
dc = {"k":105, "b":110, "m":115, "d":120, "n":80}
dd = {"p":155, "a":160, "b":165, "q":170, "r":180}
de = {"k":100, "p":60, "j":70, "r":90}

def dics_merge(diclist):
    dk = []  # List of duplicate keys
    owr = False  # Overwrite Permission
    dmg1 = {**diclist[0]}  # Merge Result - No Overwrite
    dmg2 = {**diclist[0]}  # Merge Result - With Overwrite

    for d in diclist[1:]:
        dmg2 = {**dmg2, **d}
        for k, v in d.items():
            if k in dmg1:
                dk.append(k)
            else:
                dmg1.setdefault(k, v)

    if len(dk) > 0:
        print("Duplicate Keys Detected: ", dk)
        ow = input("Shall Overwrite Existing Contents? Y/N  ")
        if ow.lower() == "y":
            owr = True

    if owr == True:
        return dmg2
    else:
        return dmg1

d_merge = dics_merge([da, db, dc, dd, de])
print(d_merge)

Outputs are as follows:
(a) Duplicate Keys List:

Output:
['b', 'd', 'a', 'b', 'k', 'p', 'j', 'r']

(b) Merge Result With No OverWrite:

Output:
{'a': 5, 'b': 10, 'c': 15, 'd': 20, 'e': 25, 'f': 55, 'g': 60, 'h': 65, 'i': 70, 'j': 75, 'k': 105, 'm': 115, 'n': 80, 'p': 155, 'q': 170, 'r': 180}

© Merge Result With OverWrite:

Output:
{'a': 160, 'b': 165, 'c': 15, 'd': 120, 'e': 25, 'f': 55, 'g': 60, 'h': 65, 'i': 70, 'j': 70, 'k': 100, 'm': 115, 'n': 80, 'p': 60, 'q': 170, 'r': 90}

Suggestions for further fine tuning of the proposed function would be most welcome.