[R] Summing up Non-numeric column

[zhiji19]

Dear All

If I have the following dataset

V1 V2
x   y
y   x
z   b
a   c
b   j
d   l
c   o

How do I use R command to get the total number of different letter in column
"V1"
column "V1" has 7 different letters.

Thank you
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