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 Python (3.8.2) (judge verdict: Wrong Answer)

N=int(input())
S=[input() for i in range(N)]
count=0
S_div=[]

if N==0:
  print(0)
  
S_div.append(S[0])
count+=1

for i in S:
  for j in range(count):
    if i == S_div[j]:
      break
    S_div.append(i)
    count+=1
  else:
    continue
      
  
else:
  print(count)