[Easy] Distinct

[문제]

배열 내 숫자 중 중복 제거한 원소의 개수를 세는 문제 

Distinct coding task - Learn to Code - Codility

[코드]

# you can write to stdout for debugging purposes, e.g.
# print("this is a debug message")

def solution(A):
    # write your code in Python 3.6
    setA = set()
    for i in A :
        setA.add(i)
    return len(setA)