Problem:
Score : 300 points

Problem Statement

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.

Sample Input 1

3
apple
orange
apple

Sample Output 1

2

You got two kinds of items: apple and orange.

Sample Input 2

5
grape
grape
grape
grape
grape

Sample Output 2

1

Sample Input 3

4
aaaa
a
aaa
aa

Sample Output 3

4

Solution in Kotlin (1.3.71) (judge verdict: Runtime Error)

fun main() {
	var (a,b,c,d) = readLine()!!.split(" ").map { it.toFloat() }
  	
  	for ( i in 1..100 ) {
      a = a - d * i
      c =  c - b * i
      if (a < 0 && c <0) {
        println("Yes")
      } else if (a <0) {
        println("No")
      } else {
		println("Yes")
      }
      
    }
      
}