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 PyPy3 (7.3.0) (judge verdict: Time Limit Exceeded)

N = int(input())
S = {}
ans = N
S = [input() for i in range(N)]
#for i in range(N):
#    S.append(input())
S.sort()
for i in range(N):
    flg = 0
    j  = 0
    while(flg == 0 and j < i):
        if i != j:
#            if len(S[j]) == len(S[i]):
#                if S[j][0] == S[i][0]:
            if S[j] == S[i]:
                S[j] = ''
                ans = ans - 1
                flg = 1
        j = j+1
print(ans)