gacha

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?

Constraints

• 1 \leq N \leq 2\times 10^5
• S_i consists of lowercase English letters and has a length between 1 and 10 (inclusive).

Input

Input is given from Standard Input in the following format:

N S_1 : S_N

Output

Print the number of kinds of items you got.

Examples

Input

3 apple orange apple

Output

2

Input

5 grape grape grape grape grape

Output

1

Input

4 aaaa a aaa aa

Output

4

inputFormat

Input

Input is given from Standard Input in the following format:

N S_1 : S_N

outputFormat

Output

Print the number of kinds of items you got.

Examples

Input

3 apple orange apple

Output

2

Input

5 grape grape grape grape grape

Output

1

Input

4 aaaa a aaa aa

Output

4

样例

4
aaaa
a
aaa
aa

4