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Gemstones
John has collected various rocks. Each rock has various minerals embeded in it. Each type of mineral is
designated by a lowercase letter in the range
. There may be multiple occurrences of a
mineral in a rock. A mineral is called a gemstone if it occurs at least once in each of the rocks in John's
collection.
Given a list of minerals embedded in each of John's rocks, display the number of types of gemstones he
has in his collection.
For example, the array of mineral composition strings
in each composite, so there are

. The minerals

and

appear

gemstones.

Function Description
Complete the gemstones function in the editor below. It should return an integer representing the number
of gemstones found in the list of rocks.
gemstones has the following parameter(s):

arr: an array of strings
Input Format
The first line consists of an integer , the size of
.
Each of the next lines contains a string
where each letter represents an occurence of a mineral in
the current rock.
Constraints

| arr[i] |
Each composition

consists of only lower-case Latin letters ('a'-'z').

Output Format
Print the number of types of gemstones in John's collection. If there are none, print

.

Sample Input
3
abcdde
baccd
eeabg

Sample Output
2

Explanation
Only

and

are gemstones because they are the only types that occur in every rock.



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