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: Accepted)

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

def histogram_sorted(data):
    table = []
    prev = data[0]
    c = 1 
    for i in range(1,len(data)):
        if prev == data[i]:
            c=c+1
        else:
            table.append([prev,c])
            prev = data[i]
            c = 1
    table.append([prev,c]) 
    return table

T = []
for i in range(N):
    T.append(S[i])
    
    
print(len(histogram_sorted(sorted(T))))