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)

def main():
    input1 = input()
    N = int(input1)
    S = [0]*N
    result = 0
    for i in range(N):
        input2 = input()
        S[i] = str(input2)

    set_S = []
    set_S = set(S)
    result = len(set_S)
    
    print(result)

if __name__ == "__main__":
    main()