For loop to replace value in one dataframe with X if it appears in another dataframe

Wondering if someone could shed some light on a for loop to perform the following.

df1

col1:
A
B
C
D
E

df2

col2:
A
C
D

If the value in df2 appear in df1, replace with X, else replace with Y and append a new column.

Final df1

col3:
X
Y
X
X
Y

source https://stackoverflow.com/questions/70713383/for-loop-to-replace-value-in-one-dataframe-with-x-if-it-appears-in-another-dataf

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