Score : 300 points
You drew lottery N times. In the i-th draw, you got an item of the kind represented by a string S_i.
How many kinds of items did you get?
Input is given from Standard Input in the following format:
N S_1 : S_N
Print the number of kinds of items you got.
3 apple orange apple
2
You got two kinds of items: apple
and orange
.
5 grape grape grape grape grape
1
4 aaaa a aaa aa
4