There is a collection of rocks where 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 the collection.
Given a list of minerals embedded in each of the rocks, display the number of types of gemstones in the collection.
Example
The minerals and appear in each rock, so there are gemstones.
Function Description
Complete the gemstones function in the editor below.
gemstones has the following parameter(s):
- string arr[n]: an array of strings
Returns
- int: the number of gemstones found
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').
Sample Input
STDIN Function
----- --------
3 arr[] size n = 3
abcdde arr = ['abcdde', 'baccd', 'eeabg']
baccd
eeabg
Sample Output
2
Explanation
Only and occur in every rock.